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| A model evaluation of the effect of implementing heavy air pollution emergency plan to PM2.5 reduction in Beijing |
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Abstract The nested air quality prediction model system (NAQPMS) was utilized to simulate a severe polluted process from January 10th to 14th, 2013. NAQPMS reproduced the variation of pollutants well, with good agreement between model simulation and observations both in tendency and magnitude. The sensitivity tests indicate that PM2.5 would be reduced by 4%~10%, 1%~6%, and 6%~12%, respectively, if the odd-even traffic control measure, the 30% industrial emission cut measures were implemented separately, or simultaneously. It was found that PM2.5 concentration was inversely correlated with its reduction ratio in the above three tests, in other words, the reduction ratio of the above measures taken in Beijing was much higher in the periods of low PM2.5 concentration. If both of the above measures were taken simultaneously over Hebei-Beijing-Tianjin (HBT) region, it would lead to 20%~35% reduction in PM2.5 concentration and air quality would be improved by one level higher, especially during the periods in areas of peak concentration. In summary, it was unreliable to limit local emissions exclusively for controlling heavy pollution of Beijing, and the combined effort in control of HBT could be a better way to solve the emergent air pollution problem in Beijing.
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Received: 28 December 2014
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