Fog haze weather雾霾天气Fog haze weather雾霾天气.doc

Fog haze weather, causing a large area of low visibility condition in the city. In the morning or at night when relative humidity is larger, forming fog; Rising temperatures, humidity drops during the day, gradually into a haze. This phenomenon is due to weather and pollution emissions. Since January 9, 2013, the central and eastern regions in serious smog and pollution of the day, the national meteorological center to upgrade to the yellow fog blue warning alert, 13 to 10 Beijing released even when the weather first haze orange alert in Beijing, in mid-january, Beijings air pollution index is close to 1000. From the northeast to the northwest, from north China to central result in huanghuai, jiangnan region, there were a wide range of severe and severe pollution. 雾霾天气，造成城市里大面积低能见度的情况。在早上或夜间相对湿度较大的时候，形成的是雾；在白天气温上升、湿度下降的时候，逐渐转化成霾。这种现象既有气象原因，也有污染排放原因。2013年1月9日以来，全国中东部地区陷入严重的雾霾和污染天中，中央气象台将大雾蓝色预警升级至黄色预警，13日10时北京甚至发布了北京气象史上首个霾橙色预警，一月中旬，北京的空气污染指数接近了1000。从东北到西北，从华北到中部导致黄淮、江南地区，都出现了大范围的重度和严重污染。 Similarities between fog and haze are visibility obstruction. But the reasons for the formation of fog and haze and conditions but theres a big difference. Fog is floating in the air of a large number of small water droplets or ice crystals, forming conditions requires a higher water vapor saturated. Appeared fog air humidity, air relative humidity is 100%, or closer to 100%. Appear when the fog effective horizontal visibility to less than 1 km. When effective 1-10 km horizontal visibility as mist. Fog has with the daily variation of air humidity and appear sooner or later, the more common or add thick, relatively reduce and disappear phenomenon during the day. A haze when air is relatively dry, air relative humidity under 80% usually. Its formation is due to a large number of tiny particles of dust, smoke, salt crystals evenly suspended in the air, make effective horizontal visibility to less than 10 km air mixed corrosion phenomenon, symbols for up. The diurnal variation of the ha