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. 2019 Jul 10;14:1517–1526. doi: 10.2147/COPD.S190600

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© 2019 Yan et al.

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Comparison of temperature, humidity and ambient air quality between Beijing and Sanya. Monthly average temperature, humidity and air quality data were obtained from the Meteorological Department of Beijing City and Sanya City. (A) Monthly average of temperature. (B) Monthly average of humidity. (C) Monthly average of air quality in Beijing and Sanya.