摘要
对兰州市2011-2015年（“十二五”期间）的6项大气环境污染物质量浓度变化状况进行了比较和分析。结果表明，2011—2015年，SO2、CO、O3的年均值质量浓度均达标，其中SO2年均值质量浓度范围23～48μg／m3，呈下降趋势；CO年第95百分位数质量浓度范围2．2-3．1mg／m3；O3第90百分位数质量浓度范围92～132μg／m3。NO2在5a间仅2a年均值数据达标，年均值质量浓度范围34～53μg／m3，变化趋于稳定。PM10、PM2.5均超标，年均值质量浓度范围PM10为120～153μg／m3，PM2.5为52～67μg／m3。2012年空气质量优良天数270d，相比2011年增加28d（据GB3095-1996）。2015年（252d）较2013年（193d）增加59d（据GB3095—2012）。
The changes in contents of six ambient air pollutants in Lanzhou during the ＂12th Five-Year＂ period （2011 ~ 2015） were studied. It has shown that in that period, the annual average concentration of sulphur dioxide, carbon monoxide and ozone were all meet the relevant standard requirements. The annual average concentration of sulphur dioxide was in range of 23 μg/m3 to 48 μg/m3 showing a descending trend, 95-percentile concentration of carbon monoxide ranged from 2.2 mg/m3 to 3.1 mg/m3, and 90-percentile concentration of ozone did from 92 μg/m3 to 132μg/m3. The annual average concentration of nitrogen dioxide was in range from 34μg/m3 to 53 μg/m3 tending to be stable whilst it was in compliance only in two of those five years. The contents of PM10 and PM2.5 were both incompliant, and the annual average concentration of the former was in range from 120 μg/m3 to 153μg/m3 and that of the latter was in range from 52 μg/m3 to 67μg/m3. According to the ambient air quality standard （GB 3095-1996）, the number of days when the air quality being in good condition reached 270 in 2012, 28 days more than that in 2011. Since 2013 when the air quality standard has been updated to GB 3095-2012 and came into effect, the number of days increased from 193 in 2013 to 252 in 2015.
出处
《上海环境科学》
CAS
2016年第5期202-207,共6页
Shanghai Environmental Sciences
关键词
环境空气质量
污染物
质量浓度
兰州市
Ambient air quality
Pollutants
Mass concentration
Lanzhou City
