The colors used for PM2.5, PM10 and Ozone (O3) are based on the US EPA standard. The colors used for Nitrogen Dioxide (NO2), Sulphure Dioxide (SO2) and Carbon Monoxyde (CO) are based on an arbitrary color standard which best matches the concentration range. It does not have any relation with the AQI breakpoints, as in most cases, the AQI for those 3 gases is most often below 50.
The scale for the color range below is expressed in raw concentration (in mg/m3).
How accurate are the forecasts? Check the correlation graphs below for PM2.5, PM10 and Ozone for the past 30 days. (Note that by default, all values below are expressed in AQI (without averaging), and that forecast values are based on the the forecast computed today for tomorrow, i.e. based on the 24H-48H forecast range).
Note: The convertion from ppm to mg/m3 for the Ozone is based on the STP US standard.
For a comparative analysis several Air Quality Forecast models applied to Beijing, check the forecast/Beijing page.
For a full list of all Air Quality Forecast models beeing analysed, check the forecast models page.
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