35 healthy Shanghai college students used a purifier for 48 hours. Here’s what happened to their bodies

There are two things we know about purifiers and one really important thing we don’t know.   1. We know that purifiers reduce PM2.5   Loads of tests have found this in labs and in real-world homes. I’ve tested the hell out of this, in my room, in bigger rooms, for 200 days of Beijing air, comparison tests against the […]

Read More

What Would China’s Air Be Like If Everyone Stopped Driving?

The prestigious science publication Nature published a study that tested the air of Beijing, Xi’an, Shanghai, and Guangzhou to find out exactly what PM2.5 is made out of. They found that about 20% were chemicals like ammonium and chloride. Coal made up about 4% of PM2.5 in the different cities.     From that composition, the researchers could estimate […]

Read More

New Data Shows Beijing’s Air Pollution Progress Reverses in March

After several months of progress cutting PM2.5, Beijing saw a sharp reversal this March, according to the latest data.   In years past, Beijing’s particulate pollution normally peaks in January and decreases each month closer to summer.     However, this year has seen the exact opposite trend, with PM2.5 increasing 265% from January to March.     […]

Read More