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Title: A space-based, high-resolution view of notable changes in urban NOx pollution around the world (2005-2014)

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1002/2015JD024121· OSTI ID:1248629
 [1];  [2];  [1];  [3];  [4];  [4];  [5];  [1]
  1. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. Space Research Association, Columbia, MD (United States)
  3. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Science Systems and Applications, Inc., Greenbelt, MD (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Morgan State Univ., Baltimore, MD (United States)

Nitrogen oxides (NOx = NO + NO2) are produced during combustion processes and, thus may serve as a proxy for fossil fuel-based energy usage and coemitted greenhouse gases and other pollutants. We use high-resolution nitrogen dioxide (NO2) data from the Ozone Monitoring Instrument (OMI) to analyze changes in urban NO2 levels around the world from 2005 to 2014, finding complex heterogeneity in the changes. We discuss several potential factors that seem to determine these NOx changes. First, environmental regulations resulted in large decreases. The only large increases in the United States may be associated with three areas of intensive energy activity. Second, elevated NO2 levels were observed over many Asian, tropical, and subtropical cities that experienced rapid economic growth. Two of the largest increases occurred over recently expanded petrochemical complexes in Jamnagar (India) and Daesan (Korea). Third, pollution transport from China possibly influenced the Republic of Korea and Japan, diminishing the impact of local pollution controls. However, in China, there were large decreases over Beijing, Shanghai, and the Pearl River Delta, which were likely associated with local emission control efforts. Fourth, civil unrest and its effect on energy usage may have resulted in lower NO2 levels in Libya, Iraq, and Syria. Fifth, spatial heterogeneity within several megacities may reflect mixed efforts to cope with air quality degradation. We also show the potential of high-resolution data for identifying NOx emission sources in regions with a complex mix of sources. Lastly, intensive monitoring of the world's tropical/subtropical megacities will remain a priority, as their populations and emissions of pollutants and greenhouse gases are expected to increase significantly.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); NASA Aura Mission; NASA Applied Sciences Program
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1248629
Journal Information:
Journal of Geophysical Research: Atmospheres, Vol. 121, Issue 2; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 295 works
Citation information provided by
Web of Science

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Decadal Shifts in Wind Patterns Reduced Continental Outflow and Suppressed Ozone Trend in the 2010s in the Lower Troposphere Over Japan journal November 2018
Twenty‐Five Years of Lower Tropospheric Ozone Observations in Tropical East Asia: The Influence of Emissions and Weather Patterns journal October 2019
Space‐Based Observations for Understanding Changes in the Arctic‐Boreal Zone journal January 2020
Recent increase of surface particulate matter concentrations in the Seoul Metropolitan Area, Korea journal July 2017
Daily Satellite Observations of Methane from Oil and Gas Production Regions in the United States journal January 2020
Satellite NO2 retrievals suggest China has exceeded its NOx reduction goals from the twelfth Five-Year Plan journal October 2016
Unexpected slowdown of US pollutant emission reduction in the past decade journal April 2018
Recent reduction in NO x emissions over China: synthesis of satellite observations and emission inventories journal October 2016
Long-Term Changes of Source Apportioned Particle Number Concentrations in a Metropolitan Area of the Northeastern United States journal January 2019
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Earth Observations and Integrative Models in Support of Food and Water Security journal February 2019
Quantifying Emissions of CO and NO x Using Observations From MOPITT, OMI, TES, and OSIRIS journal January 2019
Nitrogen Oxides Emissions, Chemistry, Deposition, and Export Over the Northeast United States During the WINTER Aircraft Campaign journal November 2018
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