YAN Huanhuan, ZHANG Xingying, WANG Weihe
The satellite remote sensing technology provides an unprecedented advantage for continuous, large spatial and shortrevisit columns during 2010-2014 over Hebei, Shandong, Henan, Anhui and Urumchi are increasing due to increased vehicles and the immature flue gas denitrification technology, while the NO2 columns over Hebei, Shandong, Henan, Anhui, Jiangsu, Shanghai, Chongqing, Guizhou and Guangzhou are decreasing due to the strong control for pollution emission from large coal-fired power plants and the effective flue gas desulfurization. On a global scale, the Eastern China, the Eastern United States, Netherlands, Germany, Italy and South Africa have high NO2 levels, while the Eastern China, the Eastern United States, South Africa and India have high NO2 pollution levels. Compared with those in 2005-2009, the NO2 columns during 2010-2014 over the Eastern China, Poland, Teheran, Baghdad, Kuwait, Riyadh, New Delhi, Dacca and Santiago are increasing, while the Eastern United States, the Pearl River Delta, Shanghai, Japan, Spain, Portugal, Northern Italy and Dubai see an obvious decreasing trend. The NO2 columns during 2010-2014 over the Northern China, the Yangtze River delta, the Pearl River Delta, the Eastern United States, Mpumalanga are decreasing obviously. The trend with the NO2 columns higher that that of NO2 is found in cities of Beijing, Shijiazhuang, Urumchi, New York, Cologne and Moscow. monitoring for atmospheric NO2 and NO2. This paper presents the spatial and temporal distributions of NO2 and NO2 from OMI over Global region and China during 2004-2014. The results show that the Beijing-Tianjin-Hebei Region, the Yangtze River delta, the Pearl River Delta, Urumchi, Shenyang and Xi'an have high NO2 columns, while the Beijing-Tianjin-Hebei Region, the Yangtze River delta, the Pearl River Delta, Sichuan and Chongqing have high NO2 columns. Compared with those in 2005-2009, the NO2 columns during 2010-2014 over Hebei, Shandong, Henan, Anhui and Urumchi are increasing due to increased vehicles and the immature flue gas denitrification technology, while the NO2 columns over Hebei, Shandong, Henan, Anhui, Jiangsu, Shanghai, Chongqing, Guizhou and Guangzhou are decreasing due to the strong control for pollution emission from large coal-fired power plants and the effective flue gas desulfurization. On a global scale, the Eastern China, the Eastern United States, Netherlands, Germany, Italy and South Africa have high NO2 levels, while the Eastern China, the Eastern United States, South Africa and India have high NO2 pollution levels. Compared with those in 2005-2009, the NO2 columns during 2010-2014 over the Eastern China, Poland, Teheran, Baghdad, Kuwait, Riyadh, New Delhi, Dacca and Santiago are increasing, while the Eastern United States, the Pearl River Delta, Shanghai, Japan, Spain, Portugal, Northern Italy and Dubai see an obvious decreasing trend. The NO2 columns during 2010-2014 over the Northern China, the Yangtze River delta, the Pearl River Delta, the Eastern United States, Mpumalanga are decreasing obviously. The trend with the NO2 columns higher that that of NO2 is found in cities of Beijing, Shijiazhuang, Urumchi, New York, Cologne and Moscow.
