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- Title
Probability of different visibility grades in China over a 50-year period.
- Authors
Wu, Jian; Zhang, Xiao; Hu, Jianyong; Zhao, Deming
- Abstract
Visibility data on sunny days, collected at 483 stations in China from 1960 to 2009, were used to examine the probability of different visibility grades. The degrees of visibility on sunny days were divided into four grades: poor grade (PG), normal grade (NG), good grade (GG), and excellent grade (EG), with probabilities of 10, 40, 40, and 10 %, respectively. The variations in the probabilities of the four grades were analyzed. The seasonal variation of the probabilities of the four grades indicated that the best air quality on sunny days was most likely to occur in the summer, followed by winter, and was least likely to occur in the spring. From 1960 to 1999, the overall patterns of the linear-trend coefficients for NG and GG were similar, while after 2000, there were large-scale decreases in the probabilities of PG and EG. The reduction in the probability of PG after 2000 may be attributed to air pollution control measures; however, the decreasing probability of EG after 2000 suggested that rapid development in China since 2000 made it difficult to attain excellent air quality.
- Subjects
CHINA; METEOROLOGICAL optics; PROBABILITY theory; ACQUISITION of data; METEOROLOGY; AIR quality; AIR pollution control; CLIMATE change; HISTORY of meteorology
- Publication
Meteorology & Atmospheric Physics, 2013, Vol 122, Issue 1/2, p115
- ISSN
0177-7971
- Publication type
Article
- DOI
10.1007/s00703-013-0277-1