... the ozone National Ambient Air Quality Standard (NAAQS). The NCFR has been designated as a nonattainment area for the ozone NAAQS since 2007. Contributing factors to the elevated pollution buildup include meteorological conditions such as the mountain-valley thermal forcing that recirculates air enriched...

...Philipp Franke; Anne Caroline Lange; Brendan Steffens; Andrea Pozzer; Andreas Wahner; Astrid Kiendler-Scharr Although anthropogenic emissions have decreased during the last 2 decades, air pollution is still problematic in Europe. This study analyzes the air quality in Europe using simulations...

... hemispheric mean values from the decay of O 3 perturbations. Tropospheric ozone Air quality Stratosphere–troposphere exchange Short-lived climate forcers Non-linear chemistry Chemical modes Ozone (O 3 ) is an essential but dangerous component of the atmosphere and the air we breathe...

...-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/ . COVID-19 lockdown Air quality Urban pollution On March 11, 2020, the World Health Organization...

... DC-8 airborne measurements collected during the Korea–United States Air Quality field study and chemical transport models. The observed total OHR (tOHR) averaged in the planetary boundary layer (PBL, <2.0 km) and free troposphere was 5.2 s −1 and 2.0 s −1 during the campaign, respectively...

... leads to the efficient formation of tropospheric ozone (O 3 ), with important consequences for tropospheric oxidative capacity and air quality. The chemical properties of PAN have stimulated the progressive development of remote-sensing products by the satellite community, and recent additions open...

...://creativecommons.org/licenses/by/4.0/ . Nitrogen dioxide Air quality America COVID-19 Transport Counties In late December 2019, a novel coronavirus (COVID-19) emerged in Wuhan and began spreading rapidly around the world ( Isaifan, 2020 ). The virus’s rapid spread led the Chinese government...

... Shin; Young-Woo Kim; Jin-Soo Choi; Jin-Soo Park; James J. Szykman; Russell W. Long; Carolyn E. Jordan; Isobel J. Simpson; Alan Fried; Jack E. Dibb; SeogYeon Cho; Yong Pyo Kim The Korea–United States Air Quality (KORUS-AQ) field study was conducted during May–June 2016. The effort was jointly sponsored...

... the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/ . VOCs Air quality Emissions...

... it with traditional filter-based methods. In this study, an air quality monitoring campaign was conducted over a period of 25 days at an urban area in Yulin city, southern China, by employing both SPAMS and traditional filter-based measurements to establish the performance of SPAMS. It was observed that the chemical...

... for the effects of meteorology, emission trends, and atmospheric chemistry when determining the lockdown effects on pollutant concentrations. In addition to emission and deposition processes, both sources and sinks of air quality relevant trace compounds are determined by atmospheric chemistry. Species...

... Shin; Hyeon Yeong Park; Changhan Bae; Eunhye Kim The Korea-United States Air Quality (KORUS-AQ) field study was conducted during May–June 2016 to understand the factors controlling air quality in South Korea. Extensive aircraft and ground network observations from the campaign offer an opportunity...

...Heejeong Kim; Junsu Gil; Meehye Lee; Jinsang Jung; Andrew Whitehill; James Szykman; Gangwoong Lee; Deug-Soo Kim; Seogju Cho; Jun-Young Ahn; Jinkyu Hong; Moon-Soo Park; Detlev Helmig; Alex Guenther To understand the characteristics of air quality in the Seoul Metropolitan Area, intensive...

... A. Peterson; Kara D. Lamb; Joshua P. Schwarz; Detlev Helmig; Md Firoz Khan The Korea – United States Air Quality Study (May – June 2016) deployed instrumented aircraft and ground-based measurements to elucidate causes of poor air quality related to high ozone and aerosol concentrations in South Korea...

... within the Eagle Ford. A lack of ambient air quality data, especially in the western shale, impedes a thorough understanding of trace gas emissions within the shale and the subsequent local/regional air quality impacts. Meteorological and trace gas instrumentation was deployed to Shape Ranch...

... of the ozone U.S. National Ambient Air Quality Standard (NAAQS) and was designated a non-attainment area of the standard in 2007. Despite State efforts to curb precursors, ozone has consistently remained above the standard. A growing number of atmospheric studies has provided an ever increasing body...

...-United States Air Quality Study (KORUS-AQ, 2016) are used to explore regional gradients in O 3 and its chemical precursors, and an observationally-constrained 0-D photochemical box model is used to quantify key aspects of O 3 production including its sensitivity to precursor gases. Box model performance...

..., meteorology is the primary factor that drives periods of unhealthy air quality and reduced visibility. The 2016 Korea-United States Air Quality (KORUS-AQ) field study provides a unique opportunity to examine the impact of meteorology on the relative influence of local and transboundary pollution. Much...

... the continental U.S., and evaluate how it influences attainment of the air quality standards. We conclude that spring and summer seasonal mean U.S. background O 3 (USB O 3 ), or O 3 formed from natural sources plus anthropogenic sources in countries outside the U.S., is greatest at high elevation locations...

... city of Chile. Specifically, we focus on the multiple links between mobility and air quality, describe the evolution of these two aspects over the past 30 years, and review the role scientific knowledge has played in policy-making. We show evidence of how technological measures (e.g., fuel quality...