Tourists take photos at Mission Hills in Haikou, capital of southernmost China's Hainan Province, March 29, 2014. According to the Ministry of Environmental Protection, Haikou met the national standard for fine air last year with an average AQI (Air Quality Index) value under 100, ranking first in the country. (Xinhua/Wang Song)
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E-mail Xinhua, April 1, 2014
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