重庆地区区域灰霾观测初步研究

2012年灰霾试点监测结果表明,灰霾日天数有明显减少。细颗粒物(PM2.5)浓度限值增加,使仅因重庆城市地域和气候原因造成部分相对湿度较低,而实际环境空气质量较好的灰霾日排除在外,更客观评价灰霾日发生规律。结合气象条件和颗粒物质量浓度对比情况表明,局域气候条件的变化将促使PM2.5和PM1吸湿增长明显,一定程度上促使粗颗粒物PM10质量浓度增加,局域污染物传输扩散不利,能见度减低,灰霾现象频增。

Study on Haze in Chongqing City

The 2012 haze pilot monitoring results show that the number of haze days obviously decreased. Fine particulate matter （PM2.5 ） concentration limit raised, so the humidity of Chongqing city is low relatively humidity, but the actual environment with better air quality to judge on haze days excluded, more objective evaluation of hazes occurrence. Combined with the meteoro- logical conditions and particle mass concentration is found, the local climate change will make PM2.5 and PM1 hygroscopic growth significantly, a certain extent prompted of the increase of the coarse particles PM10 concentration. The local pollutant transporta- tion and dispersion is adverse, reduced visibility, haze frequency.