Air pollution has seriously affected our lives and lives, so what exactly is air pollution? According to the definition given by the International Organization for Standardization (ISO), “air pollution (also called atmospheric pollution) is usually a phenomenon in which certain substances enter the atmosphere as a result of human activity or natural processes, presenting sufficient concentration for a sufficient period of time, and therefore endangering the comfort, health and welfare of the human body or the environment.” Does haze cause cancer? We now know of more than 100 air pollutants, both natural and man-made, and the latter is predominant. According to a large number of studies in recent years, atmospheric pollution is the main cause of lung cancer formation. Particulate matter (mainly PM2.5), sulfur oxides, nitrogen oxides, polycyclic aromatic hydrocarbons, radon, heavy metals and other pollutants in the atmosphere can lead to lung cancer. PM2.5 concentrations in Beijing increased by about 3% per year between 2006 and 2010. Causing an annual loss of 120 to 240 billion RMB ($19 to $39 billion) to Beijing and surrounding areas. Since December 2012, Beijing has had more than 25 days of hazy weather, with PM2.5 concentrations as high as 755 micrograms per cubic meter at one point on January 12, 2013. The concentration of harmful particles in the air reached 36 times the World Health Organization (WHO) safe level. In the Chinese capital, with a population of about 20 million, people were told to stay out as much as possible. Respiratory diseases have increased dramatically, and environmental carcinogens represented by PM2.5 will be strongly associated with the future development of lung cancer, the worst air pollution ever recorded in Beijing. Pollution has become one of the main obstacles to attracting senior overseas talent and one of the main drivers of migration for wealthy domestic citizens. Air pollution has reached dangerous extremes. It is also a warning for Beijing and the whole country to strengthen the pace of environmental protection and ecological civilization. The formation of hazy weather certainly has meteorological reasons, inverse temperature weather, humidity, etc., but more importantly, it is the decline of air quality due to the aggravation of environmental pollution caused by population growth and rough emissions. In the context of global warming, this pollution situation will undoubtedly intensify if the pollution situation is still not strongly managed. A survey shows that if you breathe in air with a PM2.5 concentration of 670 micrograms per cubic meter for a day, it is equivalent to involuntarily smoking a cigarette. We all know that smoking is harmful to health, but the situation now is that even though you can not smoke, you can not not breathe. These particulate matter is less mobile, not easily dispersed, and easily absorbed by the body. Long-term adhesion in the lungs can trigger the development of lung cancer.