In 2013–2015, the concentration of PM 2.5 in 74 cities in China showed a decreasing trend, and the concentration of PM 2.5 in the Beijing–Tianjin–Hebei region overall decreased by 27.4%; however, the decrease was only 9.9% in Beijing.
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Study of the Effects of Air Pollutants on Human Health Based on Baidu Indices of Disease Symptoms and Air Quality Monitoring Data in Beijing, China.
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