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How Much Does Large-Scale Crop Residue Burning Affect the Air Quality in Delhi?
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-04-01 , DOI: 10.1021/acs.est.0c00329
Santosh H Kulkarni 1 , Sachin D Ghude 2 , Chinmay Jena 2 , Rama K Karumuri 2 , Baerbel Sinha 3 , V Sinha 3 , Rajesh Kumar 4 , V K Soni 5 , Manoj Khare 1
Affiliation  

Elevated PM2.5 concentrations frequently cause severe air pollution events in Delhi. Till recently, the effect of crop residue burning on the air quality in Delhi has not been fully quantified and the approaches to control the impact of fire emissions have not been effective. In this study, for the first time, we quantified the statewise contribution of post-monsoon crop residue burning in the northwestern states of India to surface PM2.5 concentrations in Delhi using several sensitivity experiments with the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) and FINNv1.5 fire emission inventory. Results were evaluated with ground-based observations in Delhi (21 stations), Punjab, and Haryana (14 stations). On average, ∼20% of PM2.5 concentration in Delhi during the post-monsoon season (October-November) was found to be contributed by nonlocal fire emissions. However, on typical air pollution events, fire emissions contributed as high as 50-75% (80-120 μg/m3) to PM2.5 in Delhi, highlighting the importance of both external transport and local emissions to PM2.5 pollution in Delhi.

中文翻译:

大规模的作物残渣燃烧对德里的空气质量有多大影响?

较高的PM2.5浓度通常会导致德里发生严重的空气污染事件。直到最近,尚未完全量化德里的农作物残渣燃烧对空气质量的影响,控制火灾排放影响的方法也没有有效。在本研究中,我们首次使用天气研究和预测模型与化学方法相结合的几个敏感性实验,对印度西北部州季风后作物残渣燃烧对德里表面PM2.5浓度的状态贡献进行了定量分析。 WRF-Chem)和FINNv1.5火灾排放清单。通过在德里(21个测站),旁遮普邦和哈里亚纳邦(14个测站)的地面观测对结果进行了评估。平均而言,约占PM2的20%。发现季风后季节(10月至11月)在德里的5个浓度是由非本地火灾排放引起的。然而,在典型的空气污染事件中,火灾排放占德里PM2.5的比重高达50-75%(80-120μg/ m3),这凸显了外部运输和本地排放对德里PM2.5污染的重要性。
更新日期:2020-04-23
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