Beijing recorded its cleanest air in eight years last month, with the level of dangerous particulate matter in what was once one of the most polluted cities on earth almost back to safe levels.
The air was so foul in the early 2010s that Beijing officials introduced regulations to clean it. They also began to collect and publicise air quality data after the US embassy started to publish its readings of the city’s air quality on Twitter and made the Chinese public aware of the severity of the problem.
In January 2013 the PM2.5 level reached 160 micrograms per cubic metre against a World Health Organisation recommendation of no more than 10 micrograms per cubic metre.
Read original full article
