PM_2.5和O₃是现在空气质量恶化的主要污染物。选取2013年1月作为冬季模拟时段，利用GEOS-Chem模型分析了冬季全国燃煤电厂减排对改善PM_2.5和O₃污染的效果。结果表明，燃煤电厂NO_x、SO₂和粉尘排放虽然占据人为源排放的39.2%、19.3%和2.8%，但是对大气PM_2.5污染的减排贡献仅为8.5%。O₃污染由VOC浓度控制，O₃浓度随着污染物减排略微上升。冬季全国平均PM_2.5和O₃浓度呈现负相关，两种污染物一般不产生叠加污染。总体上，冬季在华北平原和长三角区域应当主要防治PM_2.5污染，而在黔南和中西部区域应主要防治O₃污染。

PM_2.5 and O₃ are known as main pollutants to worsen air quality.January 2013 is selected as the simulation period to represent the winter.The effect of emission reduction in coal-fired power plants in the winter on reducing pollution caused by PM_2.5 and O₃ is analyzed by means of GEOS-Chem model.It is found that the emissions of NO_x, SO₂ and dust from coal-fired power plants occupy 39.2%, 19.3% and 2.8% respectively of the total anthropogenic emissions, but only contribute 8.5% totally to PM_2.5 concentration.O₃ is controlled by VOC concentration and O₃ concentration increases slightly with the emission reduction.There is a negative correlation relationship between China's average concentration of PM_2.5 and O₃ in winter, that is, a high PM_2.5 concentration always accompanies a low O₃ concentration and vice versa.Generally, these two kinds of pollutants do not occur simultaneously.Overall in the winter, PM_2.5 is the primary pollutant in the North China Plain and the Yangtze River Delta while O₃ pollution shall be paid more attention in Qiannan and Midwest areas.

刘之琳(1989-),女,博士,工程师,主要研究方向为大气污染防治。