中文摘要：

利用2006年12月辽宁14个城市的大气环境现状监测资料和沈阳、鞍山、抚顺、本溪4城市可吸收入颗粒物（PM10，PM2．5和PM1）的监测资料，对辽宁冬季各城市的空气质量分布状况进行了综合研究。结果表明：辽宁14个城市的冬季空气质量分布状况为优、良和轻微污染3个等级，其中铁岭、营口和辽阳的空气质量有28d为良及以上等级；空气质量级别为轻微污染日数最多的城市是本溪，共计12d；其次是葫芦岛、沈阳、鞍山、抚顺、盘锦、阜新，共计7—10d。各城市的首要污染物是PM10。由于冬季燃煤量的增加，沈阳、鞍山、抚顺和本溪4城市PM2．5日平均浓度值的超标率为77．4％-90．3％。

英文摘要：

The city air quality distribution conditions were summarized by the atmospheric environmental monitoring data from 14 cities of Liaoning and the absorbable particles monitoring data such as PM10, PM2.5 and PM1 from Shenyang, Anshan, Fushun and Benxi stations in December 2006. The results showed that the air quality distribution conditions in 14 cities of Liaoning could be divided into 3 levels, i. e. excellent level, fine level and slight polluted level. And the number of days of fine and excellent levels was 28 in December in Tieling, Yingkou and Liaoyang. The number of days of little polluted level was 12 in December in Benxi, which was most among 4 cities,followed in Shenyang,Anshan, Fushun, Panjin and Fuxin with 7-10 days. PMl0 was the main pollutant in such cities. The exceeding standard ratio for daily average concentration of PM2.5 ranged from 77.4$ to 90.3 % in Shenyang,Anshan, Fushun, and Benxi because of the increase of coal combustion in winter.