Operational Monitoring of Trace Gases over the Mediterranean Sea by Giuseppe Grieco, Guido Masiello, Carmine Serio

“…These patterns are barely seen from in situ observations, a fact which stresses the importance of satellite (trace gases) data assimilation to improve the performance and quality of trace gases transport models.…”
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Effect of Lockdown due to COVID-19 on the Aerosol and Trace Gases Spatial Distribution over India and Adjoining Regions by Madineni Venkat Ratnam, Perumal Prasad, Sivan Thankamani Akhil Raj, Ibrahim Hoteit

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Impact of COVID-19 Control Measures on Trace Gases (NO2, HCHO and SO2) and Aerosols over India during Pre-monsoon of 2020 by Mriganka Sekhar Biswas, D. C. Ayantika

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Impact of 21 June 2020 Annular Solar Eclipse on Meteorological Parameters, O3 and CO at a High Mountain Site in Taiwan by Saginela Ravindra Babu, Shantanu Kumar Pani, Chang-Feng Ou-Yang, Neng-Huei Lin

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Year-long Concurrent MAX-DOAS Observations of Nitrogen Dioxide and Formaldehyde at Pune: Understanding Diurnal and Seasonal Variation Drivers by Mriganka Sekhar Biswas, Anoop S. Mahajan

“…These observations suggest that a lower boundary layer (BL) height during ONDJF leads to higher concentrations of trace gases. During June, July, August, and September (JJAS), both trace gases show a minimum in their concentrations, with average mixing ratios for NO2 and HCHO being 0.9 ± 0.6 ppb and 1.1 ± 0.7 ppb, most likely due to removal by wet deposition. …”
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Hemispheric asymmetry in recent stratospheric age of air changes by K. Dubé, S. Tegtmeier, F. Ploeger, K. A. Walker

“…<p>Many stratospheric trace gases, including <span class="inline-formula">O₃</span>, <span class="inline-formula">HCl</span>, and <span class="inline-formula">NO_y</span>, have had opposing trends in the Southern Hemisphere (SH) compared to the Northern Hemisphere (NH) during the last 2 decades. …”
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Quantifying uncertainties in satellite NO₂ superobservations for data assimilation and model evaluation by P. Rijsdijk, P. Rijsdijk, P. Rijsdijk, H. Eskes, A. Dingemans, A. Dingemans, K. F. Boersma, K. F. Boersma, T. Sekiya, K. Miyazaki, S. Houweling, S. Houweling

“…<p>Satellite observations of tropospheric trace gases and aerosols are evolving rapidly. Recently launched instruments provide increasingly higher spatial resolutions, with footprint diameters in the range of 2–8 km and with daily global coverage for polar orbiting satellites or hourly observations from geostationary orbits. …”
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Assessment and Quantification of Methane Emission from Indian Livestock and Manure Management by Anuja Samal, Saroj Kumar Sahu, Ashirbad Mishra, Poonam Mangaraj, Shantanu Kumar Pani, Gufran Beig

“…Abstract Methane (CH4) is one of the most abundant organic trace gases in the atmosphere having a strong global warming potential of 28 in 100 years, is a significant GHGs, and has a vital role in atmospheric chemistry and climate change. …”
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Source Apportionment of Urban Ammonia and its Contribution to Secondary Particle Formation in a Mid-size European City by Laura Ehrnsperger, Otto Klemm

“…Abstract Ambient air pollution caused by fine particulate matter (PM) and trace gases is a pressing topic as it affects the vast majority of the world’s population, with a particularly heavy influence in densely populated urban environments. …”
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Effect of Boundary Layer Evolution on Nitrogen Dioxide (NO2) and Formaldehyde (HCHO) Concentrations at a High-altitude Observatory in Western India by Mriganka Sekhar Biswas, G. Pandithurai, M. Y. Aslam, Rohit D. Patil, V. Anilkumar, Shrikant D. Dudhambe, Christophe Lerot, Isebelle De Smedt, Michel Van Roozendael, Anoop S. Mahajan

“…Abstract Nitrogen dioxide (NO2) and formaldehyde (HCHO) are some of the most important trace gases in the atmosphere, acting as precursors for ozone formation and as pollutants at high concentrations. …”
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Impact of COVID-19 on the Air Quality over China and India Using Long-term (2009–2020) Multi-satellite Data by Manish Soni, Sunita Verma, Hiren Jethava, Swagata Payra, Lok Lamsal, Priyanshu Gupta, Janhavi Singh

“…The COVID-19 pandemic provided an unprecedented opportunity to investigate such large-scale reduction in emissions of trace gases and aerosols. Therefore, it is important to further strengthen environmental policies to tackle air quality, human health, and climate change in this part of the world.…”
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The European summer heatwave of 2019 – a regional storyline perspective by T. Klimiuk, P. Ludwig, A. Sanchez-Benitez, H. F. Goessling, P. Braesicke, P. Braesicke, J. G. Pinto

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