Trends in OMI NO 2 observations over the United States: effects of emission control technology and the economic recession
TLDR
In this article, satellite observations of tropospheric NO2 vertical column densities over the United States (US) for 2005-2011 are evaluated using the OMI Berkeley High Resolution (BEHR) retrieval algorithm.Abstract:
. Observations of tropospheric NO2 vertical column densities over the United States (US) for 2005–2011 are evaluated using the OMI Berkeley High Resolution (BEHR) retrieval algorithm. We assess changes in NO2 on day-of-week and interannual timescales to assess the impact of changes in emissions from mobile and non-mobile sources on the observed trends. We observe consistent decreases in cities across the US, with an average total reduction of 32 ± 7% across the 7 yr. Changes for large power plants have been more variable (−26 ± 12%) due to regionally-specific regulation policies. An increasing trend of 10–20% in background NO2 columns in the northwestern US is observed. We examine the impact of the economic recession on emissions and find that decreases in NO2 column densities over cities were moderate prior to the recession (−6 ± 5% yr−1), larger during the recession (−8 ± 5% yr−1), and then smaller after the recession (−3 ± 4% yr−1). Differences in the trends observed on weekdays and weekends indicate that prior to the economic recession, NO2 reductions were dominated by technological improvements to the light-duty vehicle fleet but that a decrease in diesel truck activity has contributed to emission reductions since the recession. We use the satellite observations to estimate a 34% decrease in NO2 from mobile sources in cities for 2005–2011 and use that value to infer changes in non-mobile sources. We find that reductions in NO2 from non-mobile sources in cities have been both more modest and more variable than NO2 reductions from mobile sources (−10 ± 13%).read more
Citations
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Journal ArticleDOI
Aura OMI observations of regional SO2 and NO2 pollution changes from 2005 to 2015
Nickolay A. Krotkov,Chris A. McLinden,Can Li,Lok N. Lamsal,Edward A. Celarier,Sergey Marchenko,William H. Swartz,Eric Bucsela,Joanna Joiner,Bryan N. Duncan,K. Folkert Boersma,K. Folkert Boersma,J. Pepijn Veefkind,Pieternel F. Levelt,Vitali Fioletov,Russell R. Dickerson,Hao He,Zifeng Lu,David G. Streets +18 more
TL;DR: The Ozone Monitoring Instrument (OMI) onboard NASA's Aura satellite has been providing global observations of the ozone layer and key atmospheric pollutant gases, such as nitrogen dioxide (NO2) and sulfur dioxide (SO2), since October 2004 as mentioned in this paper.
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David G. Streets,Timothy P. Canty,Gregory R. Carmichael,Benjamin de Foy,Russell R. Dickerson,Bryan N. Duncan,David P. Edwards,John Haynes,Daven K. Henze,Marc Houyoux,Daniel J. Jacob,Nickolay A. Krotkov,Lok N. Lamsal,Yang Liu,Zifeng Lu,Randall V. Martin,Gabriele Pfister,Robert W. Pinder,Ross J. Salawitch,K. Wecht +19 more
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Air quality and climate connections.
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A space-based, high-resolution view of notable changes in urban NOx pollution around the world (2005–2014)
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TL;DR: In this paper, high-resolution NO2 data from the Ozone Monitoring Instrument (OMI) was used to analyze changes in urban NO2 levels around the world from 2005 to 2014, finding complex heterogeneity in the changes.
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Nitrate radicals and biogenic volatile organic compounds: oxidation, mechanisms, and organic aerosol
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