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Beijing air pollution
Why is Beijing so polluted?
Beijing air pollution is so bad mainly because of heavy construction, booming industry and growing private car ownership.
In December 2009, state media reported that there were 4 million cars in Beijing
The city is also ringed by mountains that trap all these harmful gases.
Coal power stations are among the worst culprits. See our research last year on how deadly coal is in China.
API: Beijing air pollution in numbers
API or air pollution index is a way of measuring how polluted the air is.
Every day Greenpeace China publishes Beijing’s air pollution index on our front page.
We get the data from China’s Ministry of Environmental Protection
What does the API measure?
The higher the API -- it can vary from 0 to 500 -- the more serious is the pollution.
The API is calcuated from readings from several measuring stations across the city and then averaged out.
Three pollutants are measured:sulphur dioxide, nitrogen dioxide and PM10.
Three other commonly measured polluants -- volatile organic compounds, ozone andPM2.5 -- are not measured:
PM2.5 is widely considered to be the most dangerous for people's health.
