March 07, 2013
Air Pollution in Asia: Real-time Air Quality Index Visual Map
"Air Quality Designation: Update to the EPA AirNow standard February 7th 2013. For historic reason, the aqicn website has been using the China MEP (Ministry of Environmental Protection) designation for the air quality levels. This is now past history, and the designation will follow, from now on, the EPA (Environmental Protection Agency) AirNow standards. The table below summarizes the differences in designation between the two standards, as well as the translations for the various languages."