People used to understand that the Chinese were inscrutable.
“The density of PM2.5 was about 350 to 500 micrograms Thursday midmorning, though the air started to clear in the afternoon. It had reached as high as 671 at 4 a.m. at a monitoring post at the U.S. Embassy in Beijing.
That is about 26 times as high as the 25 micrograms considered safe by the World Health Organization,”