When did haze become a new word?

Haze is a combination of fog and haze. Smog is common in cities. In many areas of China, fog is combined with haze as a disastrous weather phenomenon for early warning and forecasting, collectively referred to as "haze weather".

Haze is the result of the interaction between specific climatic conditions and human activities. The economic and social activities of high-density population will inevitably emit large amounts of fine particulate matter (PM 2.5). 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, it is easy to cause large-scale pollution. Scope of haze.

In 2013, "haze" 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.