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| DOI | 10.1016/j.atmosenv.2021.118801 |
| Trends in secondary inorganic particles in Hong Kong, 1995–2020 | |
| Brimblecombe P. | |
| 发表日期 | 2022 |
| ISSN | 1352-2310 |
| 卷号 | 268 |
| 英文摘要 | Hong Kong's secondary inorganic aerosol has changed over the last quarter century. It is important to assess changes in particle formation with a particular aim to assess its relationship with shifting emissions and regulatory policy over a period when air quality improved along with better visibility, likely the result of a decrease in ammonium containing aerosols. The concentrations of primary air pollutants, PM10, SO2 and NOx, declined over recent decades, while secondary pollutants SO42− and NH4+ paralleled these decreases, although NO3− shows an indistinct trend, yet the overall the sum of SO42−, NO3− and NH4+ one of decline. The importance of an automotive source led to increases in the NO3−:SO42− ratio. There is insufficient NH3 to neutralise the acid available from SO42− and NO3−, a deficit especially noticeable in June and July, when there is often not enough NH3 to form (NH4)2SO4, (NH4)HSO4 and NH4NO3 leaving free acid. Spatial variability between sites is less for aerosol SO42− and NO3− than for their precursors, and always more variable for nitrogen than sulfur. The extent of the transformation to the oxidized forms is increasing in Hong Kong, likely the result of less local SO2, and a greater proportion of SO42− transported long distances into the region. It is possible that a changing climate could lead to increased autumn ozone concentrations by 2030, so contributing to further oxidation of precursors to aerosol components. The increasing aerosol contribution via regional transport requires continued cooperation in regulatory policies to improve air quality across the Pearl River Delta. © 2021 Elsevier Ltd |
| 关键词 | Air pollutionAmmoniumNitrateSecondary inorganic aerosol (SIA)SulfateVisibility |
| 语种 | 英语 |
| scopus关键词 | Aerosols; Air quality; Ammonia; Atmospheric movements; River pollution; Visibility; Air pollutants; Emissions policies; Hong-kong; Inorganic particles; Particle formations; Primary air; Regulatory policies; Secondary inorganic aerosol; Shifting emission; Sulfur compounds; ammonia; cation; nitrate; nitrogen; nitrogen oxide; ozone; sulfate; sulfur; sulfur dioxide; volatile organic compound; aerosol; aerosol formation; air quality; concentration (composition); detection method; regulatory framework; spatial variation; spatiotemporal analysis; trend analysis; aerosol; air quality; Article; concentration (parameter); controlled study; environmental impact assessment; exhaust gas; Hong Kong; oxidation; particulate matter 10; population density; precursor; seasonal variation; visibility; China; Guangdong; Hong Kong; Zhujiang Delta |
| 来源期刊 | ATMOSPHERIC ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/248157 |
| 作者单位 | Department of Marine Environment and Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan |
| 推荐引用方式 GB/T 7714 | Brimblecombe P.. Trends in secondary inorganic particles in Hong Kong, 1995–2020[J],2022,268. |
| APA | Brimblecombe P..(2022).Trends in secondary inorganic particles in Hong Kong, 1995–2020.ATMOSPHERIC ENVIRONMENT,268. |
| MLA | Brimblecombe P.."Trends in secondary inorganic particles in Hong Kong, 1995–2020".ATMOSPHERIC ENVIRONMENT 268(2022). |
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