@BeijingAir →
NYT:
Since Sunday, the air has consistently been rated “hazardous,” meaning that people should avoid any outdoor activity; on Sunday, the particulate measurement exceeded the scale’s maximum of 500, a reading that the embassy once called “crazy bad” on its @BeijingAir Twitter feed.
The fine particles, called PM 2.5 because they are 2.5 microns in diameter or smaller, make up much of the pollution in the city, but they are not included in the air quality ratings issued by the Chinese government.
