Information about smog Introduction to smog

1. Smog is a combination of fog and haze. Smog is common in cities. Many areas in China combine fog with haze as a disastrous weather phenomenon for early warning and forecasting, collectively referred to as "haze weather". Smog is the result of the interaction between specific climate conditions and human activities. Economic and social activities with high density of population will inevitably emit large amounts of fine particulate matter (PM2.5). Once the emissions exceed the atmospheric circulation capacity and carrying capacity, the concentration of fine particulate matter will continue to accumulate. At this time, if affected by calm weather, etc., it is easy to occur. Widespread smog.

2. In 2013, “smog” became the keyword of the year. In January of this year, 4 haze events enveloped 30 provinces (autonomous regions and municipalities). In Beijing, there were only 5 non-haze days. A report shows that among the 500 largest cities in China, less than 1% meet the air quality standards recommended by the World Health Organization. At the same time, 7 of the 10 most polluted cities in the world are in China. On January 4, 2014, the National Disaster Reduction Office and the Ministry of Civil Affairs included haze weather that was harmful to health into the 2013 natural disasters for the first time. In February 2014, Beijing pointed out that the primary task to deal with haze pollution and improve air quality is to control PM2.5, which must reduce coal burning, strictly control vehicles, adjust industries, strengthen management, joint prevention and control, and governance in accordance with the law. Take major measures to focus on key areas, strictly assess indicators, strengthen environmental law enforcement and supervision, and earnestly pursue accountability. In December 2016, the most persistent smog weather since the beginning of winter arrived. Many cities have reached serious levels of pollution. It is expected to last for 4 days and will not weaken and dissipate from north to south until midnight on the 21st. The night of the 19th will enter the most serious period of this round of haze, which will affect 11 provinces and cities including Beijing-Tianjin-Hebei, Shanxi, Shaanxi, and Henan. In 2017, Premier Li Keqiang personally included “resolutely fighting the battle to defend the blue skies” in his report.