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Nitrogen Dioxide Trend over the United States: the View from the Ground, the View from SpaceEmissions of nitrogen oxides (NOx) are decreasing over the US due to environmental policies and technological change. We use observations of tropospheric nitrogen dioxide (NO2) columns from the Ozone Monitoring Instrument (OMI) satellite instrument and surface NO2 in-situ measurements from the air quality system (AQS) to quantify the trends, and to establish the relationship between the trends in tropospheric column and surface concentration. Both observations show substantial downward trends from 2005 to 2013, with an average reduction of 35 percent according to OMI and 38 percent according to AQS. The annual reduction rates are largest in 2005-2009: -6.2 percent per year and -7 percent per year observed by OMI and AQS, respectively. We examine various factors affecting the estimated trend in OMI NO2 columns and in-situ NO2 observations. An improved understanding of trend offers valuable insights about effectiveness of emission reduction regulations on state and federal level.
Document ID
20150000355
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Lamsal, Lok N. (Universities Space Research Association Greenbelt, MD, United States)
Duncan, Bryan N. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Yoshida, Yasuko (Science Systems and Applications, Inc. Greenbelt, MD, United States)
Krotkov, Nickolay A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
January 12, 2015
Publication Date
September 15, 2014
Subject Category
Earth Resources And Remote Sensing
Environment Pollution
Report/Patent Number
GSFC-E-DAA-TN18645
Meeting Information
Meeting: EOS Aura Science Team Meeting
Location: College Park, MD
Country: United States
Start Date: September 15, 2014
End Date: September 18, 2014
Sponsors: Royal Netherlands Meteorological Inst., NASA Goddard Space Flight Center, Finnish Meteorological Inst.
Funding Number(s)
CONTRACT_GRANT: NNG11HP16A
CONTRACT_GRANT: NNG12HP08C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Air pollution
remote sensing
nitrogen dioxide

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