雾霾天气.ppt

文档介绍：Tian'anmen Square in the fog. A couple were taking pictures amid the haze. The Beijing National Stadium, or the Bird' Nest Popular Science相对湿度relativehumidity雾Fog霾Haze>90%<80%能见度visibility<1km1km-10kmMeasurement AQJ (Air Quality Index) Every hourAPI (Air Pollution Index)空气污染指数SO2NO2PM10Updated Every dayWhat is PM ?Particular of fossil fuels in vehiclesPower plantsVarious industrial processesAir Quality IndexLevels of Health ConcernNumericalValueGood0-50Moderate51-100Unhealthy for Sensitive Groups101-150Unhealthy151-200Very Unhealthy201-300Hazardous> 300Off the charts!爆表了!I am in a in there!