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江苏省春季臭氧污染特征分析
杨雪1, 秦玮2, 王晨波2, 茅晶晶2
1.江苏省环境监测中心,江苏省苏力环境科技有限责任公司;2.江苏省环境监测中心
摘要:
基于2018-2020年春季江苏省臭氧(O3)监测数据,通过不同角度分析O3污染特征。结果表明:2018-2020年春季,江苏省O3浓度均超过二级标准限值,分别超出5.6%、11.3%和8.8%,沿江区域O3浓度略高于苏北区域;O3-1h日变化呈“单峰型”,峰值呈逐年上升趋势,非污染日苏北区域O3-1h浓度均高于沿江区域,主要时间段体现在夜间至次日早晨,污染日中午至傍晚时段,沿江区域O3-1h浓度高于苏北区域;O3日浓度高频区间为80-120微克/立方米,频率约为20%,沿江区域高频区间为60-120微克/立方米,苏北区域高频区间为80-140微克/立方米,频率均超过15%。沿江和苏北区域O3日浓度在临界区间的出现频率偏差不大,O3污染潜在风险相当;江苏省O3超标率呈逐年递增趋势,超标现象主要集中在4-5月;O3作为首要污染物且超标的占比逐年升高,而PM2.5作为首要污染物且超标的占比逐年降低,江苏省春季空气质量影响因子逐渐从PM2.5转为O3;平均有90%以上的O3污染日为轻度污染,受O3影响空气质量达到中度污染的占比较小,平均不到10%,未出现因O3导致的重度或严重污染日。
关键词:  臭氧(O3)  空气质量  污染特征  江苏
DOI:
分类号:
基金项目:
Study on Characteristics of ozone pollution in Jiangsu Province in spring
Abstract:
Based on the ozone (O3) monitoring data of Jiangsu Province in the spring of 2018-2020, we analyzed the O3 pollution characteristics with different perspectives. The results showed that: in the spring of 2018-2020, the concentration of O3 in Jiangsu Province was not up to the secondary standard limit of China, and was exceeding 5.6%, 11.3% and 8.8%. In the area along the river, the concentration of O3 was slightly higher than that in Northern Jiangsu. The daily variation of O3-1h was "unimodal", the peak value increased year by year, the concentration of O3-1h in Northern Jiangsu was higher than that in the area along the river on the non pollution day, the main time period was from night to the next morning,while on pollution day from noon to evening, the concentration of O3-1h along the river was higher than that in Northern Jiangsu.The high frequency range of O3 daily concentration in Jiangsu Province was 80-120 μg/m3, and the high frequency was about 20%, In the area along the river, the high frequency range was 60-120 μg/m3, and in Northern Jiangsu,the high frequency range was 80-140μg/m3, the frequency of the two areas were all over 15%. The frequency deviation of O3 daily concentration in the critical region in the two areas was not large, so the potential risk of O3 pollution in the two areas was equivalent;the exceedence probability of O3 increased year by year, exceedance was mainly concentrated in April and May; the proportion of O3 as the primary pollutant and exceeding standard increased year by year, while the proportion of PM2.5 as the primary pollutant and exceeding standard decreased year by year, so the influencing factor of spring air quality in Jiangsu province gradually changed from PM2.5 to O3; on average, more than 90% of O3 pollution days were light pollution, less than 10% of which were affected by O3, and no serious or serious pollution days due to O3.
Key words:  Ozone (O3)  air quality  Pollution characteristics  Jiangsu province