对不起，此内容只适用于美式英文。 For the sake of viewer convenience, the content is shown below in the alternative language. You may click the link to switch the active language.
A friend of mine just sent me this map of air pollution in San Francisco from the San Francisco Chronicle.
Using the latest PM2.5 data, I created a map for China using the same scale:
Based on that scale, China’s best city (which is Haikou, according to the World Health Organization database) would still be double the red limit here.
But I shouldn’t mock people for being worried about pollution. America’s PM2.5 levels are way lower than China’s, but studies in the US have still found those lower levels are harming our health.
芝加哥大学行为科学系的助理教授; Smart Air创始书呆子。
