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What is the impact of megacities on the lower atmosphere?

Urban heat island

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Megacities have a significant impact on the lower atmosphere. Urban areas such as Beijing experience frequent new particle formation (NPF) events, which contribute to the aerosol number budget . Urbanization-induced warming, known as the urban heat island effect, leads to increased exposure to extreme warming for megacity residents . Megacity emissions, particularly reactive nitrogen compounds, have a disproportionate effect on global atmospheric chemistry, with increased abundance of PAN and changes in ozone levels . Emissions from European megacities contribute to the concentration of major PM2.5 components, such as black carbon, both within the cities and in the surrounding regions . Overall, the impact of megacities on the lower atmosphere includes changes in particle formation, temperature, atmospheric chemistry, and air quality.

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Open access•Journal Article•DOI The influence of megacities on global atmospheric chemistry: a modelling study Tim Butler, Mark Lawrence - Show less +1 more 18 Jun 2009-Environmental Chemistry 53 Citations	The impact of megacities on the lower atmosphere is relatively small compared to the proportion of anthropogenic emissions from megacities. However, the effects on reactive nitrogen compounds can be disproportionately large.
Open access•Journal Article•DOI Impact of urbanization on exposure to extreme warming in megacities Do N. Khanh, Alvin C. G. Varquez, Manabu Kanda - Show less +2 more 01 Apr 2023-Heliyon 1 Citations	The provided paper does not directly address the impact of megacities on the lower atmosphere. It focuses on the impact of urbanization on exposure to extreme warming in megacities.
Open access•Journal Article•DOI Modelling the impact of megacities on local, regional and global tropospheric ozone and the deposition of nitrogen species Z. S. Stock, M. R. Russo, Tim Butler, Alexander T. Archibald, Mark Lawrence, Paul Telford, Nathan Luke Abraham, John A. Pyle - Show less +7 more 17 Dec 2013-Atmospheric Chemistry and Physics 23 Citations	The impact of megacities on the lower atmosphere includes increased surface ozone levels and changes in local chemical environments.
Journal Article•DOI Formation and growth of sub-3 nm particles in megacities: impact of background aerosols Chenjuan Deng, Runlong Cai, Chao Yan, Chao Yan, Jun Zheng, Jingkun Jiang - Show less +5 more 22 Mar 2021-Faraday Discussions 30 Citations	The provided paper is about the formation and growth of sub-3 nm particles in megacities, specifically in urban Beijing. It does not directly discuss the overall impact of megacities on the lower atmosphere.

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