邵阳市环境空气质量月报

 邵阳市环境保护监测站                 2019年9月9期（总第21期） 

1、城市环境空气质量

2019年我市共有市化工厂、市罐头厂、市一中、市环保局和市水土所五个空气质量自动站监测点，均为空气质量日报点。按照《环境空气质量标准》（GB3095-2012）监测六个基本项目：二氧化硫、二氧化氮、可吸入颗粒物（PM₁₀）、细颗粒物（PM_2.5）、一氧化碳、臭氧。

（1） 各监测项目与上年同期、上月的情况比较

二氧化硫：全市月平均浓度为20μg/m³，较上年同期上升33.3％，较上月上升25.0％。

二氧化氮：全市月平均浓度为23μg/m³，较上年同期上升35.3％，较上月上升43.8％。

可吸入颗粒物（PM₁₀）：全市月平均浓度为70μg/m³,较上年同期上升34.6％,

 较上月上升27.3％。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

细颗粒物（PM_2.5）：全市月平均浓度为44μg/m³，较上年同期上升29.4％，较上月上升25.7%。

一氧化碳：全市日均值第95百分位浓度为0.9mg/m³，较上年同期下降18.2％，较上月下降0.1%。

臭氧*：全市日最大8小时平均第90百分位浓度为185μg/m³，较上年同期上升35.0％，较上月上升20.1%。

表1      2019年9月全市环境空气污染物浓度均值统计

备注：根据《环境空气质量评价技术规范（试行）》(HJ633-2013)，CO取城市日均值百分之95位数；臭氧取城市日最大8小时平均百分之90位数

（2）环境空气质量日报状况

本月我市空气质量自动站共发布环境空气质量日报30天。空气质量指数在44～143之间，达标天数比例为60.0%。轻度污染12天，污染天数比例为40.0%，无中度、重度污染。影响我市环境空气质量的超标污染物是臭氧和PM_2.5，污染天数中首要污染物是臭氧。

与上月相比，本月优良天数比例为60.0％，比上月下降37.9％。

与上年同期相比，优良天数减少12天，综合指数上升0.29，详见表2。

表2      2019年9月全市空气质量状况统计表

2、城市降水状况

我市降水设邵阳市监测站和泉塘冲两个测点。本月市监测站测点降水pH范围为5.01～5.21， pH 月均值为5.12；本月酸性降雨频率为100％。泉塘冲测点降水pH范围为5.66～5.77，pH 月均值为5.69；本月无酸性降雨。详见表3。

表3      2019年9月全市降水监测结果统计表