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East Asia

Some of the largest changes in OMI NO2 levels between 2005 and 2014 occurred over China, Japan, and Korea.  Large increases occurred over the North China Plain of China, which is consistent with the country's booming economy over the last decade.  China's phenomenal economic growth has been fueled by the country's abundant coal reserves, but at the cost of air quality. However, the OMI data indicate that levels decreased over several of China's cities, including Beijing, Shanghai, Taipei, and the cities of the Pearl River Delta, including Hong Kong.  These cities have implemented ambitious environmental regulations to improve air quality.  National environmental regulations in Japan and South Korea have also lead to large decreases over their cities, as much as 40% over Tokyo, for instance.  Increases southwest of Seoul (Korea) are likely associated with intensive industrial infrastructure development, including petrochemical complexes.  Given that increases occurred over the ocean, it is possible that Chinese pollution impacted air quality in North Korea, South Korea and western Japan.

East Asia Regional Changes in NO2, 2005-2016

Image Credit: 
NASA's Goddard Space Flight Center

The trend map of East Asia shows the change in NO2 levels from 2005 to 2016.

Data Colorbar

Regional Data

Select from the cities below to find data and plots specific to each location. To sort, simply click on one of the column headings.

Region: East Asia
City Country Region 2016 Avg. NO2 Change (%) Uncertainty (±%)
Hong Kong China East Asia 11.92 -39.43 10.63
Chongqing China East Asia 7.12 25.65 18.64
Osaka Japan East Asia 10.24 -45.15 9.41
Shenyang China East Asia 8.45 4.22 15.40
Tianjin China East Asia 14.06 -6.21 13.61
Seoul South Korea East Asia 16.06 -24.13 11.17
Dalian China East Asia 6.65 5.30 16.60
Wuhan China East Asia 10.01 14.12 18.92
Shanghai China East Asia 18.97 -33.69 11.59
Nagoya Japan East Asia 10.60 -48.56 8.47
Harbin China East Asia 5.74 -0.82 26.86
Dongguan China East Asia 15.96 -57.16 10.72
Fuzhou China East Asia 4.21 0.49 10.29
Xian China East Asia 10.85 2.84 16.64
Beijing China East Asia 17.34 -28.67 11.07
Fukuoka Japan East Asia 4.81 -31.48 9.83
Zhengzhou China East Asia 14.15 -12.43 15.33
Chengdu China East Asia 7.81 15.06 16.64
Taipei China East Asia 6.20 -33.03 10.87
Hangzhou China East Asia 12.69 -24.78 18.48
Guangzhou China East Asia 17.69 -51.52 15.26
Nagasaki Japan East Asia 2.34 2.01 12.19
Qingdao China East Asia 9.06 -7.70 17.61
Nanjing China East Asia 13.47 -13.31 14.40
Tokyo Japan East Asia 17.40 -47.09 7.44
Quanzhou China East Asia 3.47 23.71 16.65
Shenzhen China East Asia 14.54 -51.70 9.24
Busan South Korea East Asia 6.90 -5.66 9.70
Suzhou China East Asia 14.87 -6.91 13.89