Beijing Air Quality: pm2.5

NEW: How did 2015 compare with the previous five years?
Even with a bad November and December Beijing's average dropped from 158 to 142!
5 of the 10 months with the lowest average AQI occured in 2015!

NEWER: Generate your own charts with the new chart page
Want to contact me? Use the new mail form

SORRY! My host switched me to a new server in mid September. The environment was different, which caused the page to stop working until I found out and got time to fix it. Currently it is missing data for about a week from September 20. It should be OK from here in, and in a month or so when the embassy makes their historical data available I'll add it back in so the data for the year is as good as I can get it.

Get results for ending: Now At: -- at :00
New! Beijing smog forecast from
Next time with good air: Fri 12-15 at 08:00
Next morning with clean air: Fri 12-15
Last updated at 2017-12-11 16:00 CST

More complete forecast information can be found at

Scale: US China What does this mean?

Data for previous years can be accessed in csv form from the summary pages

No data found from 2008-07-10 00:00 to 2008-07-11 0:00
Wired had an article about how the US Embassy AQI tweets helped speed up China's monitoring and addressing its pollution problem. I'd like to think my page also helped.
The original purpose of this site was to save historical data, which at the time the US Embassy did not supply. A while ago they started making it available too. The site is They have some explicit restrictions and limitations on use of their data.

More information on my site can be found here, or visit my main site. That page also has links where you can get history updates or link to a graphics label that can be put on web pages. And, for ubuntu users, there is an app that shows the current API in the top bar.

PM2.5 measurements are commonly given in 2 different units, ug/m3 and AQI. The difference between them is explained here, and here is a calculator that will let you convert one to the other. AQI only goes up to 500, what do those "crazy bad" readings mean?

Here is a story about a guy who has another, more qualitative way to show the data: every day he takes a picture of the same scene outside his window. His blog (in Chinese) is at

Daily 2014 images

Daily 2015 images

Does not work well with IE, but does with Chrome, Firefox, and Opera - and I don't care about IE.