china smog shanghai stops school activities curbs construction amid unhealthy pollution levels : Tue, 15 Dec 2015 09:09:21 -0500 - Heavy smog covering Shanghai Tuesday shut down school events, restricted construction and kept the elderly indoors with the highest air pollution levels in nearly a year. Reuters reported authorities issued a yellow alert â€" which is the third-worst on the environmental scale â€" once the air quality index reached hazardous territory. As of 6 a.m. local time, it was about 315. Good air quality index numbers are below 50.
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