Distribution of 3-year average air pollutant concentrations (µg/m3) between 25 districts in seven cities of Liaoning Province 2006–2008.
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*Range from 25th to 75th percentile of district-specific concentrations.†China national ambient air quality standard.‡WHO air quality guidelines, 2005.Abbreviations: PM10, particles with aerodynamic diameter 10 µm or less; SO2, sulfur dioxide; NO2, nitrogen dioxide; CO, carbon monoxide; O3, ozone.
创建时间：
2015-12-02
