Temporal-spatial distribution of SO2 and NO2 in Yangtze River Delta, China from 2005 to 2010

Information on monthly and yearly SO₂ and NO₂ vertical column density means over the Yangtze River Delta from January 2005 to November 2010 was reported based the remote sensing data from the OMI sensor. In conclusion, from spatial perspective, the yearly SO₂ average mean is high along the Nanjing-Shanghai railway line. And the further it is from the railway line, the less average mean is. The distribution surrounding the cities likens an island. The spatial distribution of NO₂ shares the similar characteristic. From the temporal perspective, the yearly average means of SO₂ are of a decreasing tendency, which reveals that the 11^th Five-Year Plan do control the emission of SO₂. In terms of the monthly average mean of SO₂ each year, it always drops from the high level in January and then rebounces to the original high level before the following year. However, there is a increment of yearly average means of NO₂, excluding Shanghai. Coming to monthly average mean of NO₂, it fluctuates regularly with a good periodicity. To sum up, we can conclude the 11^th Five-Year Plan have the influence on the emission of SO₂ and NO₂.