Tools, dust and fumes: a small kit used safely

Most injuries from a small tool kit don't come from the tool being dangerous. They come from the tool being used for the wrong job, or in the wrong state: a chisel used as a screwdriver, a hammer with a cracked handle, a saw with its guard taken off. The dust is slower. What you breathe while cutting a paving slab or sanding a board can do its damage over years, long after the job is forgotten. This lesson gathers the few tools the earlier lessons asked for, then takes each hazard in turn: the tool itself, the dust, the fumes, and the battery on charge.

"Isolate the power before you open anything up" has a tool-sized meaning in this lesson: a power tool is unplugged, or (on this course's reading) its battery taken out, before you change a blade or a bit, as the section on power tools sets out. The box stays shut, as it did in lessons 5 and 6, and the two facts that go with it still hold. CPSC, the US Consumer Product Safety Commission, says panel boxes "are usually electrically live, even with the main circuit breakers turned off".¹³ And HSE's guidance for people who work on electrical systems does not recommend "non-contact devices such as 'volt sticks'" for proving anything dead.¹⁴

Where this lesson touches the law, this is general information, not legal advice. The rules differ between England, Wales, Scotland and Northern Ireland, and between US states and cities, and they change.

Whose rules these are

This section states law. This is general information, not legal advice.

Almost every source in this lesson was written for people at work. OSHA, the US Occupational Safety and Health Administration, wrote its booklet Hand and Power Tools for employers and employees under its workplace standards.¹ HSE, the Health and Safety Executive, which regulates workplace health and safety in Great Britain, wrote its construction dust sheet to tell "employers what they need to know to prevent or adequately control construction dust risks", and its wood dust sheet for woodworking employers.³⁴ OSHA's respirator and silica rules bind employers.⁸¹⁰ And HSE says of its own sheet: "Following the guidance is not compulsory, unless specifically stated, and you are free to take other action."³

So none of these rules is written for a householder's own DIY, and this course read no rule on masks or goggles at home that is. The advice is the other half. These are the best-specified practice anyone this course read has written for cutting, drilling and sanding, and the dust does not know whether you are being paid. Where the rules this course read say nothing about a householder, the label follows the advice. Where this lesson says a job is Yours, on conditions, the conditions come from these workplace sources, applied at home as this course's reading.

A small kit, chosen by the jobs

This course does not give a shopping list, and it names no brand. The kit is whatever the jobs in these lessons asked for, and the list below is this course's, drawn from the methods it has already taught. Most of the tools are there because a named source's method used them; the torch (flashlight) is the course's own.

North Seattle College's beginners' home repair course asks each student to bring "eye goggles, a respiratory mask, and ear protection".¹⁵ That is one adult-education course's list, not a standard, but it is the same three this lesson adds.

What the list leaves out matters as much. It has no volt stick, because HSE doesn't recommend one for proving anything dead, and no tool for the inside of the box, because the box is not yours.¹⁴ Woodworking and making things belong to Tools and Making Things, later on the Core, and this course does not teach them.

Hand tools: how an ordinary tool hurts

OSHA's booklet puts the whole hand-tool problem in one sentence: "The greatest hazards posed by hand tools result from misuse and improper maintenance."¹ Its examples are worth reading as a list of habits to lose:

• "If a chisel is used as a screwdriver, the tip of the chisel may break and fly off, hitting the user or other employees."
• "If a wooden handle on a tool, such as a hammer or an axe, is loose, splintered, or cracked, the head of the tool may fly off and strike the user or other employees."
• "If the jaws of a wrench are sprung, the wrench might slip."
• Impact tools such as chisels and wedges with "mushroomed heads" (spread at the struck end, like a mushroom's cap) "might shatter on impact, sending sharp fragments flying toward the user or other employees."¹

Look at what the four have in common. Three are about the tool's state (a cracked handle, sprung jaws, a mushroomed head) and one about its job (a chisel doing a screwdriver's work). In each, the hazard is something leaving the tool at speed or the tool leaving the work. OSHA's booklet describes what happens, not the physics of why, and this lesson stays with its description.

The booklet then gives five basic rules for hand and power tools alike. Four are about the tool: "Keep all tools in good condition with regular maintenance." "Use the right tool for the job." "Examine each tool for damage before use and do not use damaged tools." "Operate tools according to the manufacturers’ instructions." The fifth is about you: "Provide and use properly the right personal protective equipment."¹

The booklet is a US workplace document, written for employers and employees. That these rules carry over to a kitchen drawer is this course's reading, and it is not a large leap: nothing in the four examples depends on who pays for the hammer. Using a sound hand tool for its own job is Yours. A tool with a cracked handle, sprung jaws or a mushroomed head is out of use until it's repaired or replaced.

Power tools: the precautions

OSHA's list of general precautions for power tools is short, and nearly every line is a habit rather than a piece of equipment:¹

• "Never carry a tool by the cord or hose."
• "Disconnect tools when not using them, before servicing and cleaning them, and when changing accessories such as blades, bits, and cutters."
• "Keep all people not involved with the work at a safe distance from the work area."
• "Secure work with clamps or a vise, freeing both hands to operate the tool."
• "Avoid accidental starting. Do not hold fingers on the switch button while carrying a plugged-in tool."
• Dress for it: "Loose clothing, ties, or jewelry can become caught in moving parts."
• And take a damaged portable electric tool out of use and tag it "Do Not Use".

On guards, OSHA is flat: "Safety guards must never be removed when a tool is being used."¹ For a powered grinder it adds: "Always use eye or face protection."¹

OSHA's booklet doesn't define "disconnect", but a line just above it in the same list uses the word for a cord: "Never yank the cord or the hose to disconnect it from the receptacle."¹ So this course reads it as the plug, not the tool's own switch. The booklet says nothing about cordless tools; taking the battery out is this course's reading of the same rule, and the tool's manual comes first where it says more. It is the same shape as lesson 6's rule that a plug is opened only when it's out of the socket.

Electrical Safety First (ESF), a UK charity that campaigns on electrical safety, adds three lines for a British reader using power tools at home: "Use an RCD or plug-in RCD." "Check leads and plugs on power tools." And if the lead or plug shows damage, "for example, frayed wires", "get the equipment professionally repaired before using it or get it replaced."⁵ Lesson 5 explained what an RCD does and lesson 6 what a plug-in RCD is for; neither is retaught here.

Using a sound power tool for its own job, by the maker's instructions, with the guard on, is Yours, on conditions, and OSHA's list is the conditions.

Eyes and ears

OSHA's booklet says that eye protection is needed with a powered grinder, and that "safety goggles and gloves" are the kind of equipment needed against the hazards of hand tools at work.¹ This course did not read a standard for eye protection in either country, so it names none. This course's reading, from OSHA's examples of fragments flying off a struck chisel or a grinder: wear eye protection whenever a tool can throw something, which covers drilling, cutting, grinding and chiselling. And read the marking and the maker's information on the pack to see what it is made for.

For noise, OSHA's booklet says "Noise is another hazard associated with pneumatic tools", and asks for hearing protection with noisy tools such as jackhammers.¹ This course read no source giving a noise level for household power tools, so it gives no number. North Seattle College's kit list includes ear protection, and so does this one.

If something does get into an eye, First Aid and CPR lesson 10, "Burns, cuts and small injuries", covers it: don't rub it, and what to do next in each country. This lesson doesn't reteach it.

Dust: why it's slow, and why it matters

This section states law. This is general information, not legal advice.

HSE's construction dust sheet opens: "Construction dust is not just a nuisance; it can seriously damage your health and some types can eventually even kill."³ It names three kinds:³

• Silica dust, made when working on silica-containing materials "like concrete, mortar and sandstone";
• wood dust, "created when working on softwood, hardwood and wood-based products like MDF and plywood";
• "other ‘general’ dust", from materials with little or no silica, the commonest being gypsum (in plasterboard), limestone, marble and dolomite.

Silica

HSE says silica is in most rocks, sand and clay, and in "bricks, tiles, concrete and mortar". Cutting, drilling, grinding and polishing them makes dust, and "Some of this dust is fine enough to get deep into your lungs." That fine dust is "too fine to see with normal lighting". And: "Silica is the biggest risk to construction workers after asbestos."⁶ On silicosis, HSE's page says this about the thing that makes it different from a cut: "The effect continues to develop after exposure has stopped and is irreversible."⁶

OSHA says the same from the American side. Respirable crystalline silica is "very small particles at least 100 times smaller than ordinary sand you might find on beaches and playgrounds", and it "is created when cutting, sawing, grinding, drilling, and crushing stone, rock, concrete, brick, block, and mortar". OSHA lists silicosis as "an incurable lung disease that can lead to disability and death", with lung cancer, COPD and kidney disease beside it.⁷

That is the mechanism, as far as these sources give it: the dust that harms you is the dust you can't see, it goes deep, and the damage is slow and one-way. So a job that looks clean in daylight isn't evidence of anything.

Wood dust

HSE's wood dust sheet, written for woodworking employers, says "All wood dust is a substance hazardous to health because it can cause serious non-reversible health problems", and names asthma, dermatitis, and irritation to the eyes, nose and throat. "Hardwood dust can also cause a rare type of nasal cancer."⁴ Its account of which dust matters is the same as the silica pages': "The biggest risk is from fine dust, as you can breathe this deep into your lungs where it will do the most damage."⁴

And on cleaning up: "Do not use compressed airlines or dry sweeping, particularly on clothing, as these will just create dust clouds and redistribute the dust."⁴ OSHA's silica rule bars employers on construction sites from dry sweeping and from cleaning with compressed air where it could add to a worker's exposure, with narrow exceptions.⁸

What to do about it, in HSE's order

HSE's sheet puts the controls in an order, and the order is the lesson:³

1. Stop or reduce the dust before you start. HSE: "Use different materials, less powerful tools or other work methods." Fewer cuts, materials the right size, a hand method instead of a power tool.
2. Stop it getting into the air. Water, "enough water supplied at the right levels for the whole time that the work is being done", and HSE adds: "Just wetting the material beforehand does not work." Or on-tool extraction, a hood on the tool connected to an extraction unit of the right class, and "Don’t just use a general commercial vacuum." HSE grades these units H (high), M (medium) or L (low) by their filter, and for the jobs in its table it asks for H or M.
3. Then respiratory protection, which HSE calls RPE (respiratory protective equipment). "Remember: RPE is the last line of protection."

HSE also names where you work as a risk factor: "the more enclosed a space, the more the dust will build up", and it adds: "do not assume that dust levels will be low when working outside with high-energy tools".³ A garage with the door down is an enclosed space.

For a householder drilling a few holes, HSE's table has a row that fits: "Occasional short-duration drilling with hand-held rotary power tools". Its controls are equipment that stops dust getting into the air where possible, from a dust collector at the bit or a cordless extractor on the drill for smaller bits, and otherwise a respirator with a protection factor of 20.³ The next section says what that factor means.

Masks: what they stop, and what they don't

This section states law. This is general information, not legal advice.

In the UK, the disposable dust respirators HSE describes are marked to a standard and graded FFP1, FFP2 or FFP3. HSE's page on dust masks: "FFP1, FFP2 and FFP3 respirators can reduce the amount of dust you breathe by factors of 4, 10 and 20 respectively."² A factor of 20 means you breathe a twentieth of the dust in the air. HSE's construction dust sheet sets the general level for construction dust at that factor of 20, and names the FFP3 disposable mask as the common way to get it; its wood dust sheet says the same for woodworking.³⁴ HSE's page on dust masks has no date, points readers to guidance due "in autumn 2005", and was written for farm work, so it's old. Its factor of 20 for FFP3 matches the 2020 construction sheet's.

In the US, NIOSH, the National Institute for Occupational Safety and Health, certifies respirators. An N95 "Filters at least 95% of airborne particles. Not resistant to oil."⁹ OSHA's respirator rule for workers gives the class that includes filtering facepieces an assigned protection factor of 10, and adds that its factors "are only effective when the employer implements a continuing, effective respirator program as required by this section (29 CFR 1910.134), including training, fit testing, maintenance, and use requirements."¹⁰

Those are two different measures. NIOSH's 95% is what the filter stops. OSHA's 10 is what a worker wearing that class of mask is assigned inside a fit-tested programme. And HSE's factors are for the UK grades. This course does not convert one into another, and neither should you: in the UK, read the FFP grade; in the US, read the N95 and the NIOSH approval.

The "dust mask" that isn't one

Some masks sold for dust are not respirators at all. HSE calls them nuisance dust masks or comfort masks: they carry no standard marking, often have only one head strap, and their packaging may say "This product does not provide respiratory protection", or something similar.² HSE's wood dust sheet is plainer: "Nuisance dust masks do not filter out wood particles and hence provide no protection against wood dust, so they should not be used."⁴ In the US, NIOSH keeps a Certified Equipment List for checking whether a respirator is NIOSH approved.⁹

Why a beard defeats it

The mask works by sealing to your face, so the air you breathe comes through the filter and not round the edge. HSE: "A respirator that depends on face fit is useless if you have a beard or thick beard stubble."² Its wood dust sheet gives the mechanism: "Facial hair or glasses tend to lift the respirator off the face and permit inward leakage of contaminated air."⁴ Its construction sheet: anyone using a tight-fitting mask "also needs to be clean shaven."³ OSHA's rule for workers says the same in its own terms: an employer may not let anyone wear a tight-fitting respirator who has "Facial hair that comes between the sealing surface of the facepiece and the face or that interferes with valve function".¹⁰ For a bearded worker, HSE's wood dust sheet points to a hood or helmet type instead, which doesn't depend on a face seal.⁴

The check you do every time

HSE says a proper fit test is the only way to know the seal is good enough, and that, at present, it is also the only way of meeting the legal requirements (the page is written for people at work).² At home, the check you can do is HSE's pre-use check, for a disposable respirator of the kind it describes: "You should carry out a pre-use check every time you put on your respirator." Fit it by the maker's instructions, with the straps and the nose strip adjusted, "then hold the mask in place and breathe in or out sharply. You should readjust the respirator if you detect any leakage around your face or your glasses steam up when you breathe out."² NIOSH points to the donning instructions in or on the respirator's packaging; it also links a wearing guide that covers a user seal check, which this course didn't read.⁹ Wearing a marked, well-fitted respirator is Yours, and the pre-use check is part of wearing it.

Fumes: solvents, strippers and the stripper the US stopped selling

This section states law. This is general information, not legal advice.

EPA, the US Environmental Protection Agency, counts paints, paint strippers and other solvents among the sources of volatile organic compounds (VOCs) in a home, and says "Concentrations of many VOCs are consistently higher indoors (up to ten times higher) than outdoors."¹¹ Paint stripping is EPA's example of the worst of it: "During and for several hours immediately after certain activities, such as paint stripping, levels may be 1,000 times background outdoor levels."¹¹ The health effects EPA says VOCs may cause include eye, nose and throat irritation, and headaches, loss of coordination and nausea.¹¹

EPA's advice, for a product whose label says to use it in a well-ventilated area: "go outdoors or in areas equipped with an exhaust fan to use it. Otherwise, open up windows to provide the maximum amount of outdoor air possible."¹¹ Buy small: "buy only as much as you will use right away". And don't bin (throw out) the leftovers: "Do not simply toss these unwanted products in the garbage can." Use a household hazardous waste collection if your area runs one.¹¹ That is US advice. For the UK, this course read no official page on solvents at home, so it says only: read the tin, and follow the maker's instructions. Lesson 20, "Walls and paint: filling, preparing and painting", comes back to paints and their labels.

The mask, as the last section showed, is no help here; what helps is air.

Methylene chloride

One solvent needs its own paragraph. EPA's indoor air page says of methylene chloride, found in paint strippers, adhesive removers and aerosol spray paints, that it "is converted to carbon monoxide in the body and can cause symptoms associated with exposure to carbon monoxide".¹¹ Lesson 11, "Carbon monoxide and the alarms that warn you", is about carbon monoxide from burning fuel. This is carbon monoxide made in the body from a vapour, with no flame anywhere.

The US law has moved. EPA's page on the chemical says that in March 2019 it issued a final rule to prohibit the manufacture, processing and distribution of methylene chloride for consumer paint and coating removal, "because of the acute fatalities that have resulted from exposure to the chemical in consumer paint and coating removal".¹² In April 2024 it finalised a wider rule, which "Prohibits manufacturing, processing and distribution of methylene chloride for all consumer uses."¹² That is federal law, and this course read EPA's own summary of it, not the rules' text. EPA's summary describes both rules as prohibiting manufacture, processing and distribution; it says nothing about a tin a householder already owns beyond encouraging them to stop using it.

What EPA encourages a householder with an old tin to do: "EPA is encouraging all consumers to stop using methylene chloride products that they may have already purchased for paint and coating removal." For disposal: "Please consult your state and local government solid waste agencies to obtain proper disposal instructions for leftover or unused paint and coating removal products."¹²

EPA's two pages don't read the same. The indoor air page, updated in June 2026, still says to "Use products that contain methylene chloride outdoors when possible; use indoors only if the area is well ventilated."¹¹ The rule page is the one about the rules, and it encourages consumers to stop.¹² This course does not explain the difference, because EPA does not. For paint removal, it follows the page that deals with the rule.

This course read no UK rule on methylene chloride, so it says nothing about the UK position. If you find an old tin in Britain, the label and your council's hazardous waste service are the places to ask.

A shelf sanded in Denbighshire

Take a simple job first. In a flat in Denbighshire, someone has cut a new MDF board for a shelf and wants to sand its edges smooth with a corded power sander. The steps are in the order this lesson's sources give.

1. Less dust first. HSE's table has a row for "Sanding wood with power tools", and the first way it gives to limit the dust is "Using ‘pre-finished’ materials".³ If a ready-finished board would do, that is the job with the least dust. Here the board is already cut, so on to the next step.
2. The tool. ESF: check the lead and plug, and use an RCD or a plug-in RCD.⁵ OSHA: clamp the board so both hands are on the sander, keep other people clear, and unplug it to change the sanding sheet.¹
3. Where. HSE says dust builds up the more enclosed the space is. For other people, it suggests keeping them away and enclosing the work with sheeting or screens so the dust doesn't escape, and indoors it adds general ventilation to remove dusty air.³ So outside if you can, and indoors a room that nobody else is using, with the window open; the respirator matters more, not less, in a small room. That last part is this course's reading.
4. Extraction, then the mask. HSE's controls for this row are on-tool extraction to an H or M class extraction unit "and" a respirator with a factor of 20: both, not either.³ A sander's own dust bag isn't what HSE describes, and HSE says not to rely on a general commercial vacuum, so without the right unit the respirator carries more of the job. An FFP3, pre-use checked, and eye protection.²
5. Clean up. No dry sweeping and no blowing the dust off: HSE's wood dust sheet says both "just create dust clouds and redistribute the dust".⁴

Sanding a board this way is Yours, on conditions, and the conditions are HSE's, OSHA's and ESF's. What makes it simple is that the material is known and new, which the next case's is not.

A garage in New Mexico

This one has three problems, and you're going to find them before you read them.

A man in New Mexico, with a full beard, wants to lay a short path. On a cold, windy Saturday he cuts concrete pavers in his attached garage with the big door pulled most of the way down, using a borrowed handheld masonry saw, cutting dry. He's wearing a white one-strap mask from a multipack whose box says it's for nuisance dust. When the path is done, he plans to strip an old door in the same garage with a tin of paint remover he found on the shelf. The label says it contains methylene chloride.

Batteries and chargers

Cordless tools run on lithium-ion packs. The London Fire Brigade (LFB) says that in London "On average there’s a fire from a lithium-ion battery in an e-bike or e-scooter every two days", and that "Many of these fires happen in homes while batteries are charging."¹⁶ That is London's figure, and about e-bikes and e-scooters. This course read no US battery figure and gives none.

LFB's advice on batteries and chargers is written about phones, laptops and other devices, not tool packs. Applying it to a cordless drill's battery is this course's reading, and the tool's own manual comes first where it says something different. LFB says batteries can be a fire risk "when over-charged, short-circuited, submerged in water or if they are damaged".¹⁷ Its tips:¹⁷

• "Always use the charger that came with your phone, tablet, e-cigarette or mobile device", and if you replace it, a genuine one from a supplier you can trust.
• Avoid storing, using or charging batteries at very high or low temperatures.
• Protect them from being crushed, punctured or immersed in water.
• "Don’t leave items continuously on charge after the charge cycle is complete".
• "Never cover chargers or charging devices".

If a battery starts swelling or expanding, LFB's steps are: "Stop charging immediately", "Turn off the device", "Do not remove the casing or tamper with the equipment", and "Contact the manufacturer or certified technician".¹⁷ For a tool pack, this course reads "turn off" as taking it off the charger and out of the tool; LFB doesn't say. A swollen pack is Call someone: the maker, not a screwdriver.

What people get wrong

"Any dust mask will do." Nuisance masks aren't respirators, and a face-fit respirator is useless over a beard (HSE).²

"My dust mask covers the stripper fumes too." Dust masks filter dust only (HSE); fumes need air (EPA).²¹¹

"A blunt blade is the safe one." OSHA says the opposite for knives and scissors.¹

"If I can't see the dust, it isn't there." The silica that matters is "too fine to see with normal lighting" (HSE).⁶

"Wet the slab first and it won't be dusty." HSE: "Just wetting the material beforehand does not work." Water has to be there for the whole cut.³

"The switch is off, so I can change the blade." OSHA says disconnect the tool, which this course reads as the plug (or, on a cordless tool, the battery), not the switch.¹

Practice

For your plan

To the stop list: any material you think might be asbestos or old paint before you cut, sand or scrape it; a swollen battery; any old tin of methylene chloride stripper; any tool with a cracked handle, sprung jaws, a mushroomed head or a damaged lead. To the calendar: a look over the kit and the chargers, each spring and autumn, with the other seasonal checks. And for the repair write-up: if your one repair makes dust, step 2 of the exercise is its plan.

Connections

Lesson 5, "Electricity: what trips, and why", explained what an RCD does, and lesson 6, "Plugs, leads and electrical fires", gave the rule that a plug is opened only when it's out of the socket. Power tools have the same rule for blades and bits. Lesson 11, "Carbon monoxide and the alarms that warn you", is about carbon monoxide from burning; methylene chloride is a route that has nothing to do with a flue. First Aid and CPR lesson 10, "Burns, cuts and small injuries", has what to do about something in the eye.

Drilling into a wall, with the cables, pipes and materials that can be hidden in it, has a lesson of its own, lesson 14, "Before you drill: cables, pipes and what's in the wall", which uses this lesson's dust and masks. Lesson 15, "Ladders and working at height", takes the same tools up a ladder, where the risk is the fall. Lesson 19, "Asbestos, lead paint and radon: what not to disturb", teaches the materials that stop a cut or a sanding job before it starts. And Tools and Making Things, later on the Core, takes the kit further than repairs.

Go deeper

• HSE, Construction dust, CIS36. Six pages, free, read here in full. Written for employers: the three kinds of dust and the order of the controls, with a table of common jobs.
• OSHA, Hand and Power Tools, OSHA 3080. Read here in full. Dated and workplace-facing: a list of how tools hurt people and what stops it.
• EPA, "Volatile Organic Compounds' Impact on Indoor Air Quality". Read here in full. The US government's page on solvents and paints at home, with its ventilation advice.
• London Fire Brigade, "Batteries and chargers". Read here in full. Short, and the charging advice this lesson used.

Sources

1. Occupational Safety and Health Administration, Hand and Power Tools, OSHA 3080, 2002 (Revised). Read: the whole booklet; general precautions, guards, electric tools and abrasive wheels read closely; re-read 25 September 2026. US workplace guidance, written for employers and employees.
2. Health and Safety Executive, "All you need to know about disposable dust masks". Read: full text, re-read 25 September 2026. No date shown; written for agriculture, and it points to guidance due in autumn 2005.
3. Health and Safety Executive, Construction dust, Construction Information Sheet No 36 (Revision 3), first published 06/13, revised 03/20. Read: full text, 26 September 2026. Written for employers.
4. Health and Safety Executive, Wood dust: Controlling the risks, Information Sheet No 23 (Revision 3), first published 11/12, revised 06/22. Read: pages 1 to 3, 6 and 7 (the risks, the law, respiratory protection), 26 September 2026. Written for woodworking employers.
5. Electrical Safety First, "Advice for DIY-ers". Read: full text, re-read 25 September 2026. A UK charity that campaigns on electrical safety; the survey's date isn't given.
6. Health and Safety Executive, "Cancer and construction: Silica" and "Silicosis: causes and risk controls". Read: full text of both, re-read 25 September 2026.
7. Occupational Safety and Health Administration, "Silica, Crystalline" (overview). Read: the overview page, 26 September 2026.
8. 29 CFR 1926.1153, Respirable crystalline silica (construction), on OSHA's site. Read: paragraphs (a) to (f), including Table 1 and the housekeeping rules, 26 September 2026. Federal; binds employers.
9. National Institute for Occupational Safety and Health, "Find Filtering Facepiece Respirators on the Certified Equipment List", 18 February 2025, Internet Archive capture 20260923185140 of cdc.gov (the live page blocks automated readers). Read: full page.
10. 29 CFR 1910.134, Respiratory protection, on OSHA's site. Read: the definitions, paragraph (d)(3)(i)(A) with Table 1 and its notes, and paragraph (g)(1), 26 September 2026. Federal; binds employers.
11. US Environmental Protection Agency, "Volatile Organic Compounds' Impact on Indoor Air Quality", last updated 23 June 2026. Read: full text, re-read 25 September 2026.
12. US Environmental Protection Agency, "Risk Management for Methylene Chloride", last updated 6 March 2026. Read: full text, 25 September 2026. EPA's summary of its 2019 and 2024 rules; the rules' own text was not read.
13. US Consumer Product Safety Commission, Publication 5133, "Preventing Home Fires: Arc Fault Circuit Interrupters (AFCIs)", dated R042012. Read: full text.
14. Health and Safety Executive, Electricity at work: Safe working practices, HSG85, third edition, 2013. Read: the whole PDF extracted; "Proving dead" paragraphs 53 to 55 read. Workplace guidance, used here only for what it says about non-contact testers.
15. North Seattle College, continuing education, "Basic Hands-On Home Repair and Maintenance". Read: full course page.
16. London Fire Brigade, "E-bikes and e-scooters: fire safety advice". Read: full text, re-read 25 September 2026. No date shown; London only.
17. London Fire Brigade, "Batteries and chargers". Read: full text, re-read 25 September 2026. No date shown; written about phones, laptops and similar devices.