The air environmental quality of Ma′anshan City in Anhui Province was investigated by using of the Air Pollution Index (API) method. The result showed that the air environmental quality at Ma’anshan City during 1997...The air environmental quality of Ma′anshan City in Anhui Province was investigated by using of the Air Pollution Index (API) method. The result showed that the air environmental quality at Ma’anshan City during 1997-2000 was Ⅱ-Ⅰ grade (the air quality is just good), and the critical pollutants were TSP or NOx. Compared with other methods, the usage of API method may accurately reveal and easily calculate the degree of air pollution, and let the local residences and environmental personnel clearly understand the circumstance of air pollution.展开更多
利用全国756基准站1994—2013年MICAPS地面常规观测资料和47个城市2002—2012年国家环境保护总局公布的空气污染指数（the Air Pollution Index,API）数据,对北京、南京、重庆沙坪坝、广州4个大城市霾日和API的气象条件进行分析。结果...利用全国756基准站1994—2013年MICAPS地面常规观测资料和47个城市2002—2012年国家环境保护总局公布的空气污染指数（the Air Pollution Index,API）数据,对北京、南京、重庆沙坪坝、广州4个大城市霾日和API的气象条件进行分析。结果表明：1）我国霾日和API的高值区主要分布在中东部地区,年霾日自1998年开始上升,并持续增长,到2013年达到最多。1月霾日最多,8月霾日最少。2002—2012年期间,与年霾日不同,年API呈下降趋势,12月API最高,8月API最低。四大城市的霾日和API的年际变化和月际变化均存在较大差异。2）一般情况下,霾发生时,北京、南京、重庆沙坪坝、广州对应的相对湿度较高;霾发生时,北京西南风占主导作用,南京和广州均东南风占主导作用,重庆沙坪坝西北风占主导作用,风速多集中在1~4 m/s,负变压及低层大气稳定时更易产生霾日。3）低层稳定度（γ850）对四大城市的API的影响各不相同,北京和重庆沙坪坝与γ850呈负相关,即越稳定,API值越高,南京和广州与γ850呈正相关,即越不稳定,API值越高。4）多元线性回归方程的结果表明：热力因子（相对湿度、γ850）和动力因子（地面风速、24 h变压）对四大城市冬季霾日能见度和冬季API各有贡献。展开更多
文摘The air environmental quality of Ma′anshan City in Anhui Province was investigated by using of the Air Pollution Index (API) method. The result showed that the air environmental quality at Ma’anshan City during 1997-2000 was Ⅱ-Ⅰ grade (the air quality is just good), and the critical pollutants were TSP or NOx. Compared with other methods, the usage of API method may accurately reveal and easily calculate the degree of air pollution, and let the local residences and environmental personnel clearly understand the circumstance of air pollution.
