The Impact of Lockdown on Air Quality in Pakistan during the COVID-19 Pandemic Inferred from the Multi-sensor Remote Sensed Data by Rehana Khan, Kanike Raghavendra Kumar, Tianliang Zhao

“…The association of meteorology with air pollutants found that the periods of enhanced temperature and relative humidity likely contributed to a cleaner environment over the Indus Basin Region (IBR) and Balochistan Plateau (BP). …”
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Health and economic cost estimates of short-term total and wildfire PM2.5 exposure on work loss: using the consecutive California Health Interview Survey (CHIS) data 2015–2018 by Michael Jerrett, Yu Yu, Ying-Ying Meng, Diane Garcia-Gonzales, Mohammad Z Al-Hamdan, Miriam E Marlier, Joseph L Wilkins, Ninez Ponce

“…Instruction To help determine the health protectiveness of government regulations and policies for air pollutant control for Americans, our study aimed to investigate the health and economic impacts of work loss due to sickness associated with daily all-source and wildfire-specific PM2.5 (particulate matter with an aerodynamic diameter smaller than 2.5 μm) exposures in California.Methods We linked the 2015–2018 California Health Interview Survey respondents’ geocoded home addresses to daily PM2.5 estimated by satellites and atmospheric modelling simulations and wildfire-related PM2.5 from Community Multiscale Air Quality models. …”
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Reflections by a member of the Editorial Board by Kevin T. Smith

“…Afterwards they obtained a joint Yugoslav American Project, “Possible alterations of wood in air polluted trees”, which defined my earlier collaborations with Professor Torelli and Katarina Čufar on silver fir decline in Slovenia and Europe. …”
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Insights into ozone pollution control in urban areas by decoupling meteorological factors based on machine learning by Y. Qiu, X. Li, X. Li, W. Chai, Y. Liu, M. Song, X. Tian, Q. Zou, W. Lou, W. Zhang, J. Li, Y. Zhang

“…When meteorological conditions deteriorate, the atmosphere's capacity to cleanse pollutants decreases, leading to the accumulation of air pollutants. Although a series of emission reduction measures have been implemented in urban areas, the effectiveness of O<span class="inline-formula">₃</span> pollution control proves inadequate. …”
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WRF-Chem simulations of snow nitrate and other physicochemical properties in northern China by X. Wang, X. Wang, T. Che, T. Che, X. Ruan, S. Yue, S. Yue, J. Wang, J. Wang, C. Zhao, C. Zhao, C. Zhao, L. Geng, L. Geng, L. Geng

“…These results illustrate the ability of WRF-Chem to simulate snow properties including concentrations of reservoir species in northern China, and in the future, we will incorporate snow nitrate photolysis in the model, exploring the emissions of snow NO<span class="inline-formula">_<i>x</i></span> from nitrate photolysis and the impacts on local and regional atmospheric chemistry and air pollutant transformations.</p>…”
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Measurement Report: Changes in ammonia emissions since the 18th century in south-eastern Europe inferred from an Elbrus (Caucasus, Russia) ice-core record by M. Legrand, M. Legrand, M. Vorobyev, D. Bokuchava, S. Kutuzov, S. Kutuzov, A. Plach, A. Stohl, A. Khairedinova, V. Mikhalenko, M. Vinogradova, S. Eckhardt, S. Preunkert

“…<p>Atmospheric ammonia (NH<span class="inline-formula">₃</span>) is a key transboundary air pollutant that contributes to the impacts of nitrogen and acidity on terrestrial ecosystems. …”
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