Lloyd Alter writes at TreeHugger:
According to the Real Time Air Quality Index, a score of 150-200 is unhealthy, and “Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.” A score of 201-300 is very unhealthy, “Health warnings of emergency conditions. The entire population is more likely to be affected.” Over 300: “Health alert: everyone may experience more serious health effects.”
It hit 271 on Sunday. On Saturday morning when I took these photos, you could barely see across Tiananmen Square. It made my eyes water and my throat sore. Much of it is from seriously damaging particulates known as PM2.5, or particulate matter smaller than 2.5 microns, coal fired power stations and industries around Beijing are blamed. There are a lot of VOC’s (volatile organic chemicals); China Daily notes that these weren’t even measured until 2010.
“If we hope to see real changes to the country’s air quality, coordinated control of multiple pollutants, including VOCs, is a must,” Yang Jintian, head of the Atmospheric Environment Institute at the Chinese Academy for Environmental Planning, told China Daily.