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Today's dirty air caused by cold front

SHANGHAI'S air is moderately polluted today due to a cold front that brought sand and dust from north China.

The Shanghai Environmental Monitoring Center issued an air pollution alert at 8:38am this morning and said the PM2.5 reading rose to 143 micrograms per cubic meter by 7am.

PM2.5 stands for airborne particles smaller than 2.5 micrometers, which are the main cause of urban smog and haze and are harmful to human health.

The center said the pollution will last the whole day and advised people suffering cardiovascular and respiratory diseases to stay indoors.

The PM2.5 reading began to drop after 7am and fell to 80.8 micrograms around 2pm, but the PM2.5 density in the past 24 hours still averaged 139.3 micrograms per cubic meter, compared with the national standard of 75 micrograms.


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