Is the Laser Egg Only Accurate in Beijing?

A few months ago, Smart Air tested the Laser Egg, the Node, and the Dylos against official PM2.5 readings. The results were way better than I expected! All three machines correlated r = .90 or higher with the gold-standard numbers, which is very high. But this test may have exaggerated their … Read more

Is Asbestos a Problem in India?

What is Asbestos?   Asbestos is a mineral that makes a great fiber. People use that fiber in lots of building materials, like insulation, paints, electric wiring, wall boards, and floor tiles. It might be all around us.    Should I Be Concerned?   When any of these materials break apart, … Read more

Is Asbestos in China a Problem?

Asbestos in China is a commonly used building material, and it may be more dangerous than formaldehyde. So why do so few people talk about asbestos in China? Contrast that with other pollutants. One day a few years ago, a Chinese friend of mine asked me about jiaquan (甲醛). “Huh?” I … Read more

Car Air Pollution Stopped Driving

Do We Need Car Air Purifiers? Do they Work?

Car air purifiers sound like a great idea. But do we need them? Do car air purifiers even work?  Soon after I started making DIYs, people emailed me asking if we could make an air purifier for their car. My initial reaction was, “Great idea!” On the highways, we’re surrounded … Read more

Shanghai Technical Inspection Bureau Mask Tests

It’s tough to get good mask data on a wide range of consumer masks. I’ve posted some of my own test data and test data from Dr. Saint Cyr. But another great source of even more mask tests comes from the Shanghai Municipal Bureau of Quality and Technical Supervision. I’ve linked to … Read more

Dylos DC1100

How Accurate Are Common Particle Counters?

When I started Smart Air in 2013, I wanted to buy an air quality monitor. I had basically two options. I could buy a US$260 Dylos or spend thousands of dollars on the crazy expensive particle counters. Since then, the market has exploded with new air quality monitors as cheap as … Read more

3m mask fit

How to Do a Mask Fit Test at Home: Poor Man’s Fit Test

Since mask fit-test machines cost $10,000, many people need a simpler, practical way to check that their mask is sealing properly on their face. This simple four-step “poor man’s fit test” will help people check the fit of their mask and find leaks. I was fortunate enough to visit 3M’s … Read more

Smart Air is a social enterprise that creates simple, no-nonsense air purifiers and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.