Research shows that there is almost no big industry in a big city like Beijing, and PM2.5 mainly comes from life-centered pollution sources. PM2.5 has an important impact on air quality and visibility. PM2.5 has a small particle size, is rich in a large number of toxic and harmful substances, stays in the atmosphere for a long time and has a long transportation distance, so it has a great impact on human health and atmospheric environmental quality.
Besides motor vehicle emissions, catering is also an important pollution source. "The cooking habits of ordinary people are mostly frying, and there are many lampblack. Research shows that 30% of PM2.5 is organic matter, which is closely related to catering.
According to the monitoring of Institute of Atmospheric Physics, Chinese Academy of Sciences, among the sources of PM2.5 in Beijing, the proportion of oil fume emissions accounts for 13%, even higher than 8% of industrial emissions, and the kitchen has become the hardest hit area of PM2.5. In this regard, someone made a simple experiment specifically for the influence of oil fume on PM 2.5.
Most health effects are considered to be caused by the small particle size fraction of PM2.5 rather than the large particle size fraction. The degree of harm mainly depends on its composition, concentration and particle size. If the concentration of PM2.5 in the air is higher than 10 μ g/m3 for a long time, the risk of death will start to rise. With the increase of the concentration of 10 μ g/m3, the total death risk increased by 4%, the death risk of heart and lung diseases increased by 6%, and the death risk of lung cancer increased by 8%. Caring for life begins in the kitchen and begins with reducing oil smoke emissions.