Beijing To Reduce Smog ‘Red Alerts’ – By Raising The Threshold
one way to do it.
weeks after Beijing issued its first ‘red alert’ warnings informing people when
smog hits a critical level, the city’s environmental watchdog is raising the threshold.
a red alert is issued when the Air quality index (AQI) is expected to reach 200
for two days in succession. U.S. authorities classify a 200 index as 'very
China’s Xinhua News reports new rules taking effect in March will require a daily
average (AQI) of 500 for a red alert to be announced. In addition 300 for two
days in a row or 200 for four days will also trigger the highest alert.
Beijing's first red alert was issued in December, schools were closed and outdoor
construction work suspended because of the dense smog.
city is taking steps to counter the smog at its source – or at least some of
its sources. Last month the city said it would start closing down more than
2000 small firms known as heavy polluters.