CBC
BEIJING (Reuters) - Beijing's city government ordered 1,200 factories near the Chinese capital, including a major oil refinery run by state oil giant Sinopec, to shut or cut output on Saturday after authorities issued the highest possible air pollution alert.
On Friday, China's environmental watchdog issued a five-day warning about choking smog spreading across the north and ordered factories to shut, recommended residents stay indoors and curbed traffic and construction work.
Red alerts are issued when the air quality index (AQI), a measure of pollutants in the air, is forecast to break 200 for more than four days in succession, surpass 300 for more than two days or overshoot 500 for at least 24 hours. ...
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