Beijing’s Key Air Pollution Measure Hits Record Low

What’s new: Beijing’s annual average concentration of PM2.5 — ultrafine particles in the air that are hazardous to health — dropped to 30 micrograms per cubic meter last year, the lowest level since records began in 2013, according to the city’s environmental watchdog.

It was also the only second time that the gauge met the national standard of a maximum of 35 micrograms, the Beijing Municipal Ecology and Environment Bureau said in a statement Wednesday.