... mobile sources and the contribution of local meteorology to ozone (O 3 ) and particle formation in Bogotá (Colombia), Santiago (Chile), and São Paulo (Brazil). The impact of mobility reductions (50%–80%) produced by the early coronavirus-imposed lockdown was assessed through high-resolution vehicular...

... contributions of daily emissions for 3 air pollutants: fine particulate matter (PM 2.5 ), ozone (O 3 ), and nitrogen dioxide (NO 2 ). This approach is implemented for Washington, DC, first for 2011, to identify urban pollution sources, and again for 2016, to examine the pollution response to changes...

...Margot T. Flynn; Erick J. Mattson; Daniel A. Jaffe; Lynne E. Gratz Summertime ozone in the Western United States presents a unique public health challenge. Changes in population, background ozone, wildland fire, and local precursor emissions combined with terrain-induced meteorology can affect...

...-level findings from companion papers in this special issue are also summarized and discussed in relation to the factors controlling fine particle and ozone pollution, current emissions and source apportionment, and expectations for the role of satellite observations in the future. Resulting policy...

... emissions participated in the model intercomparison study and were used to conduct air quality simulations focusing on ozone (O 3 ), aerosols, and their precursors for the campaign. Using the KORUSv5 emissions inventory, which has been updated from KORUSv1, the models successfully reproduced observed...

...; V. Naik; S. Oltmans; D. A. Plummer; L. E. Revell; A. Saiz-Lopez; P. Saxena; Y. M. Shin; I. Shahid; D. Shallcross; S. Tilmes; T. Trickl; T. J. Wallington; T. Wang; H. M. Worden; G. Zeng Our understanding of the processes that control the burden and budget of tropospheric ozone has changed...

...P. Cristofanelli; F. Fierli; F. Graziosi; M. Steinbacher; C. Couret; F. Calzolari; F. Roccato; T. Landi; D. Putero; P. Bonasoni Tropospheric ozone (O 3 ) is a greenhouse gas as well as a harmful air pollutant with adverse effects on human health and vegetation: The observation and attribution...

..., provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/ . KORUS-AQ Air quality Ozone NO x and VOCs PM 2.5 SMA (Seoul Metropolitan Area) Tropospheric ozone (O 3 ), which is known as a short-lived climate pollutant, is a potent greenhouse...

.... Digangi; Yonghoon Choi; Sally E. Pusede; Greg L. Huey; David J. Tanner; Michelle Kim; Paul Wennberg; Detlev Helmig; Jochen Stutz The Seoul Metropolitan Area (SMA) has a population of 24 million and frequently experiences unhealthy levels of ozone (O 3 ). In this work, measurements taken during the Korea...

...://creativecommons.org/licenses/by/4.0/ . Ozone Ozone production efficiency (OPE) KORUS-AQ Chemical Transport model Air pollution in East Asia has been an important issue especially for densely populated mega-cities with the rapid development over the past few decades. Although stringent air pollution...

... compounds (VOC) and nitrogen oxides (NO x ), which through photochemical reaction form ground-level ozone, an air pollutant that can trigger adverse health effects e.g. on the respiratory system. This study explores the range of impacts of a potential shale gas industry in these two countries on local...

... observations of ozone in the lower atmosphere in the 19th century, both measurement methods and the portion of the globe observed have evolved and changed. These methods have different uncertainties and biases, and the data records differ with respect to coverage (space and time), information content...

...S. J. Oltmans; L. C. Cheadle; B. J. Johnson; R. C. Schnell; D. Helmig; A. M. Thompson; P. Cullis; E. Hall; A. Jordan; C. Sterling; A. McClure-Begley; J. T. Sullivan; T. J. McGee; D. Wolfe; Brian Lamb; Michael E. Chang, Ph.D. Data from ground-based ozone (O 3 ) vertical profiling platforms operated...

... (the sum of nitric oxide (NO) + nitrogen dioxide (NO 2 )) in the surface layer. In contrast, ozone (O 3 ) declined by ~15 ppb during the first phase of the eclipse compared to median August diurnal mixing ratios. Similar O 3 signatures were observed at a series of network stations along the Northern...

...Daniel A. Jaffe; Owen R. Cooper; Arlene M. Fiore; Barron H. Henderson; Gail S. Tonnesen; Armistead G. Russell; Daven K. Henze; Andrew O. Langford; Meiyun Lin; Tom Moore; Detlev Helmig, Ph.D.; Allen Goldstein Ozone (O 3 ) is a key air pollutant that is produced from precursor emissions and has...

....; Alastair Lewis This Tropospheric Ozone Assessment Report (TOAR) on the current state of knowledge of ozone metrics of relevance to vegetation ( TOAR-Vegetation ) reports on present-day global distribution of ozone at over 3300 vegetated sites and the long-term trends at nearly 1200 sites. TOAR-Vegetation...

... and commercial aircraft. Ozone (O 3 ) soundings began in the early 1960s and now provide a few thousand vertical profiles per year at several dozens stations throughout the world. airborne observations representativeness ozone carbon monoxide IAGOS GAW The study will focus on Frankfurt, Germany...

... quantifies the present-day global and regional distributions (2010–2014) and trends (2000–2014) for five ozone metrics relevant for short-term and long-term human exposure. These metrics, calculated by the Tropospheric Ozone Assessment Report, are: 4 th highest daily maximum 8-hour ozone (4MDA8); number...

...-February 2013 documented dramatically different atmospheric ozone (O 3 ) mole fractions. In 2012 O 3 remained near levels of ∼40 ppb in a well-mixed 500–1000 m deep boundary layer while in 2013, O 3 mole fractions >140 ppb were measured in a shallow (∼200 m) boundary layer. In contrast to 2012 when mole...

...Peter K. Peterson; Kerri A. Pratt; William R. Simpson; Son V. Nghiem; Lemuel X. Pérez Pérez; Eric J. Boone; Denis Pöhler; Johannes Zielcke; Stephan General; Paul B. Shepson; Udo Frieß; Ulrich Platt; Brian H. Stirm; Detlev Helmig; Joël Savarino Boundary layer atmospheric ozone depletion events (ODEs...