文章基本信息

标题：Determining VOCs Reactivity for Ozone Forming Potential in the Megacity of São Paulo
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作者：Débora Souza Alvim ; Luciana Vanni Gatti ; Sergio Machado Corrêa 等
期刊名称：Aerosol and Air Quality Research
印刷版ISSN：1680-8584
出版年度：2018
卷号：18
期号：9
页码：2460-2474
DOI：10.4209/aaqr.2017.10.0361
语种：English
出版社：Chinese Association for Aerosol Research in Taiwan
摘要：High ozone (O3) concentrations are a major concern about air quality in the São Paulo Metropolitan Area (SPMA). During 2016, the 8-hour state standard of 140 µg m–3 was exceeded on 32 days, whereas the 1-hour national standard of 160 µg m–3 was exceeded on 76 days. Exposure to such unhealthy O3 levels and other pollutants can lead to respiratory disease. The focus of this study is to determine the main O3 precursor in terms of the volatile organic compounds (VOCs) in order to provide a scientific basis for controlling this pollutant. In this work, 66 samples of hydrocarbons, 62 of aldehydes and 42 of ethanol were taken during the period from September 2011 to August 2012 from 7:00 to 9:00 a.m. The OZIPR trajectory model and SAPRC atmospheric chemical mechanism were used to determine the major O3 precursors. During the studied period, aldehydes represented 35.3% of the VOCs, followed by ethanol (22.6%), aromatic compounds (15.7%), alkanes (13.5%), ketones (6.8%), alkenes (6.0%) and alkadienes (less than 0.1%). Considering the concentration of VOCs and their typical reactivity, the simulation results showed that acetaldehyde contributed 61.2% of the O3 formation. The total aldehydes contributed 74%, followed by aromatics (14.5%), alkenes (10.2%), alkanes (1.3%) and alkadienes (e.g., isoprene; 0.03%). Simulation results for the SPMA showed that the most effective alternative for limiting the O3 levels was reducing the VOC emissions, mainly the aldehydes.
关键词：Ozone forming potential;Air quality;VOCs;Incremental reactivity