邵阳市环境空气质量月报

 邵阳市环境保护监测站                 2019年4月4期（总第16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11μg/m³，较上年同期下降45.0％，较上月下降26.7％。

二氧化氮：全市月平均浓度为20μg/m³，较上年同期下降4.80％，较上月下降25.9％。

可吸入颗粒物（PM₁₀）：全市月平均浓度为42μg/m³,较上年同期下降37.3％,

 较上月下降16.0％。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

细颗粒物（PM_2.5）：全市月平均浓度为30μg/m³，较上年同期下降23.1％，较上月下降21.1%。

一氧化碳：全市日均值第95百分位浓度为1.0mg/m³，与上年同期持平，较上月下降20.0%。

臭氧*：全市日最大8小时平均第90百分位浓度为112μg/m³，较上年同期下降13.8％，较上月下降6.7%。

表1      2019年4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27～78之间，达标天数比例为100%。无轻度、中度、重度污染。影响我市环境空气质量的首要污染物是细颗粒物（PM_2.5）和臭氧。

与上月相比，本月优良天数比例为100％，比上月上升3.2％。

与上年同期相比，优良天数比例上升10%，综合指数下降1.5，详见表2。

表2      2019年4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5.15～5.77， pH 月均值为5.35；本月酸性降雨频率为90.9％。泉塘冲测点降水pH范围为5.71～6.28，pH 月均值为5.83；本月酸性降雨频率为0。详见表3。

表3      2019年4月全市降水监测结果统计表