Effects of Anthropogenic and Biogenic Volatile Organic Compounds on Los Angeles Air Quality
Effects of Anthropogenic and Biogenic Volatile Organic Compounds on Los Angeles Air Quality
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DOI：
10.1021/acs.est.1c01481
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发表时间：
2021-09-08
影响因子：
11.4
通讯作者：
Faiola, Celia
中科院分区：
文献类型：
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作者：
Gu, Shan;Guenther, Alex;Faiola, Celia
鉴于目前的政策目标，评估挥发性有机化合物（VOCs）在臭氧和二次有机气溶胶（SOA）产生中的作用尤为重要。在这里，我们估算了人为和生物源性VOC排放的臭氧形成潜力（OFP）和SOA形成潜力（SOAP），以评估(1)人为VOCs和主导OFP和SOAP的相关部门；(2)城市绿化项目增加的生物源性VOCs对洛杉矶县空气质量的潜在影响。在目前的情况下，乙烯的OFP最大，其次是间、对二甲苯、甲苯、丙烯和甲醛。SOAP的前五大贡献者是甲苯、矿物油、苯、十七烷和十六烷。移动源和溶剂源是OFP和SOAP的主要VOC源。未来城市绿化带来的生物源性VOC排放的潜在增加对城市空气质量产生了显著影响，抵消了减少人为VOC排放的好处。该研究表明，洛杉矶县和其他城市的城市绿化计划需要考虑人为和生物源VOC对二次污染的贡献，绿化城市应考虑使用低VOC排放的植被类型，以避免进一步恶化城市空气质量。
Assessing the role of volatile organic compounds (VOCs) in production of ozone and secondary organic aerosol (SOA) is especially important in light of ongoing policy goals. Here, we estimated the ozone formation potential (OFP) and SOA formation potential (SOAP) of anthropogenic and biogenic VOC emissions to evaluate (1) anthropogenic VOCs and associated sectors that dominate OFP and SOAP and (2) the potential impacts of enhanced biogenic VOCs from urban greening programs on air quality in Los Angeles county. In the present-day scenario, ethylene had the largest OFP followed by m & p-xylene, toluene, propylene, and formaldehyde. The top five contributors to SOAP were toluene, mineral spirits, benzene, heptadecane, and hexadecane. Mobile and solvent sources were the dominant VOC sources for both OFP and SOAP. The potential increases in biogenic VOC emissions due to future urban greening had significant effects on urban air quality that offset the benefits of reducing anthropogenic VOC emissions. This study demonstrates that urban greening programs in Los Angeles county, and likely other cities as well, need to account for both anthropogenic and biogenic VOC contributions to secondary pollution, and greening cities should consider using vegetation types with low VOC emissions to avoid further degradation to urban air quality.