Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto M5S 3E5, Canada.
Environ Sci Technol. 2024 Jun 25;58(25):11074-11083. doi: 10.1021/acs.est.3c10753. Epub 2024 Jun 13.
The contribution of volatile chemical products (VCPs) to ambient air pollution has increased following decades of regulating combustion sources. There is a research gap concerning the impact of indoor physicochemical phenomena on VCP emissions. In this work, a bottom-up speciated VCP emission inventory with indoor-outdoor resolution was developed for Canada, an industrialized country with low air pollution levels, whose major cities are among the largest urban areas in North America. VCPs were estimated to account for about 290 kilotons of gaseous organic emissions for a typical year in the 2010s, with more than 60% of emissions occurring indoors. Coatings and cleaners were the most emissive VCP categories. Oxygenated species and saturated aliphatics dominated the chemical profiles of most emissions. Less than 5% of VCP emissions were impacted by indoor physicochemical phenomena. VCP emissions were predicted to account for 0.8-3.2 s of OH reactivity and 0.22-0.52 μg/m of secondary organic aerosol formation potential in major urban areas in Canada. Our predictions aligned with previous measurements concerning indoor and outdoor organic pollutant levels, underscoring the important air quality impacts of VCPs relative to other sources. Our results provide helpful insights for future research regarding VCP emissions, especially from indoor spaces.
挥发性化学产品（VCPs）对大气污染的贡献在数十年对燃烧源进行调控后有所增加。目前，有关室内物理化学现象对 VCP 排放影响的研究还存在空白。在这项工作中，针对加拿大（一个空气污染水平较低的工业化国家）开发了一种具有室内-室外分辨率的化学成分类挥发性化学产品排放清单，其主要城市属于北美的最大城市之一。据估计，在 2010 年代的典型年份，VCPs 产生了约 290 千吨的气态有机排放，其中 60%以上发生在室内。涂料和清洁剂是排放挥发性化学产品最多的类别。含氧物种和饱和脂肪族化合物在大多数排放物的化学特征中占主导地位。不到 5%的挥发性化学产品排放受到室内物理化学现象的影响。预测 VCP 排放将占加拿大主要城市中 0.8-3.2 s 的 OH 反应性和 0.22-0.52 μg/m 的二次有机气溶胶形成潜力。我们的预测与之前关于室内和室外有机污染物水平的测量结果一致，这突显了与其他来源相比，挥发性化学产品对空气质量的重要影响。我们的研究结果为未来有关挥发性化学产品排放的研究，特别是来自室内空间的研究，提供了有价值的见解。
