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To take certain precautions. EPA warned that children, the elderly and people with heart disease, lung disease and other vulnerable populations should stay indoors, stop outdoor activities; municipal colleges and universities, schools and kindergartens to reduce outdoor activities; the general population to reduce the time for outdoor sports and outdoor work . [Analysis] weather conditions and increased coal combustion is the main cause of Zhengzhou Municipal Environmental Monitoring Center Zhanfuzhanzhang phase Fan Club, he said that the process is pollution from at 18:00 on November 25 began, the air pollution index began to rise significantly since then. From the analysis of meteorological conditions, between 18:00 to 20:00 the same day, the relative humidity occurs rush (from 38% to 84%), the temperature plummeted (from -0.8 to 4.6 â„\x83), reduce wind speed (from 5.0m / s to 1.8 m / s), and the emergence of urban vortex, weather conditions are not conducive to the spread of pollutants, air quality appears rapid decline in short, sharp rise in the value of AQI (air pollution index). 1. The emergence of strong temperature inversion, which is not conducive to the spread of pollutants due to the pressure in both games, there has been a strong temperature inversion phenomenon, static ground wind or breeze, pollutant dispersion conditions are very bad. Because contaminants are compressed to near the ground, with the accumulation of superimposed pollutants, various atmospheric pollutants have seen a slight increase. Plus after snow in the air relative humidity increases, the wind speed is small and stable, resulting in a very small part of the gaseous pollutants condense into particles, resulting in the state was enriched air pollutants. 2. After the snow, cold weather, increased consumption of coal-fired heating Another important reason is that, due to the cold weather after the snow, increasing heating load, increased consumption of coal-fired central heating, suburban engaging rural residents scattered coal heating Burning increased, resulting in low-level air pollution dispersion soot, carbon monoxide concentration rises. [] Heavy pollution weather forecast is expected to last until December 2 Today, the city of Zhengzhou AQI will be 185 to 215, ambient air quality is moderate or severe pollution, the primary pollutant PM2.5. Tomorrow urban ambient air quality mild or moderate pollution. Acquired urban ambient air quality is expected to be transformed into good or slightly polluted. [Measures] EPA sent factory monitor has been discontinued, although some companies and real-time air pollution in Beijing, Tianjin region compared to Zhengzhou