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City warns of air pollution as PM2.5 spikes
By Cai Wenjun |
September 19, 2012, Wednesday
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Online Edition
Online Edition
Shanghai Environmental Monitoring Center issued an air quality warning this morning advising people with respiratory and heart diseases to stay indoors as the city suffers light air pollution.
The center's PM2.5 reading indicates the density of airborne particles in Shanghai surpassed the national air quality standard yesterday afternoon and reached 197mg per cubic meter at 8am this morning, more than double the standard.
The density began to drop after 8am but still stayed at 126mg per cubic meter at 11am. The national standard is 75mg per cubic meter.
Airborne particles less than 2.5 micrometers in size or about 1/30th the average width of a human hair can penetrate deep into the lungs, enter the bloodstream and cause diseases.
The center's PM2.5 reading indicates the density of airborne particles in Shanghai surpassed the national air quality standard yesterday afternoon and reached 197mg per cubic meter at 8am this morning, more than double the standard.
The density began to drop after 8am but still stayed at 126mg per cubic meter at 11am. The national standard is 75mg per cubic meter.
Airborne particles less than 2.5 micrometers in size or about 1/30th the average width of a human hair can penetrate deep into the lungs, enter the bloodstream and cause diseases.
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