Turnaround of Tropospheric Nitrogen Dioxide Pollution Trends in China, Japan, and South Korea

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    • Irie Hitoshi
    • Center for Environmental Remote Sensing, Chiba University
    • Muto Takuya
    • Center for Environmental Remote Sensing, Chiba University
    • Itahashi Syuichi
    • Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry
    • Kurokawa Jun-ichi
    • Asia Center for Air Pollution Research, Japan Environmental Sanitation Center
    • Uno Itsushi
    • Research Institute for Applied Mechanics, Kyushu University


Long-term (2005-2015) tropospheric nitrogen dioxide (NO<sub>2</sub>) column data recorded by the satellite-borne Ozone Monitoring Instrument (OMI) in East Asia were analyzed to investigate annual trends on an national basis and their potential causes. We found an evident decrease of 6% year<sup>−1</sup> in the NO<sub>2</sub> level over China after 2011. The grid-basis trend analysis implies that the rapid decrease occurred on a provincial or larger spatial scale and was likely due to a nationwide action such as the widespread use of denitrification units. In Japan and South Korea, a turnaround indicating an increase was observed after 2013 and 2012, respectively. As a consequence, the tropospheric NO<sub>2</sub> pollution level in East Asia was found to be recovered to the 5-year-ago level in 2015.


  • SOLA

    SOLA 12(0), 170-174, 2016

    Meteorological Society of Japan


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