Beijing Air Quality: pm2.5

Beijing's average PM2.5 has continued to improve dramatically

(partial year)
2009 2010 2011 2012 2013 2014 2015 2016 2017
150 166 166 159 151 162 158 141 132 118
Not only was the best month in the last 10 years recorded in 2017 (August, average 90.1), but December (96.3) was the 3rd highest, and 9 months placed in the top 18 of the 115 recorded. The worst month (February, 126.9) came in 27th. November and December actually had a full 1/3 of their readings GREEN! See the monthly comparison chart

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New! Beijing smog forecast from
Next time with good air: Tue 02-27 at 08:00
Next morning with clean air: Tue 02-27
Last updated at 2018-02-21 22:00 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 2008-12-28 00:00 to 2008-12-29 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.