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Cold snap brings air pollution

Shanghai is breathing dirty air today as a cold front brought in airborne pollutants from the north last night, the Shanghai Environmental Monitoring Center said this morning.

Shanghai is shrouded in smog and fog as the hourly density of PM2.5 reached 221.9 micrograms per cubic meter by 7:30am. Experts reminded people with cardiovascular and respiratory diseases to stay indoors.

The city's PM2.5 index – density of airborne particles smaller than 2.5 micrometers in diameter – rose from 60 micrograms per cubic meter early yesterday morning to 250 micrograms by 10am this morning.

The 24-hour average reading was 161 micrograms, compared with the nation's standard of 75 micrograms, the monitoring center said.


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