This is nowhere near as bad as the pollution was in China in January 2013 though. The image below was taken on a day when the US Embassy ground based sensors registered PM2.5 measurements of 291 micrograms per cubic meter of air and the air quality index (AQI) in Beijing was 341. An AQI above 300 is considered hazardous to all humans. On January 12, the peak of the air crisis, AQI was 775 the U.S Embassy Beijing Air Quality Monitor—off the U.S. Environmental Protection Agency scale—and PM2.5 was 886 micrograms per cubic meter. Jon Steward of the Daily Show called this air that you could chew.