The effects on human health due to poor air quality mainly involve the respiratory system and the cardiovascular system. Individual reactions to air pollutants depend on the type of pollutant a person is exposed to, the degree of exposure, the individual's state of health and genetics.
Indoor air pollution and poor urban air quality are listed as two of the world's worst toxic pollution problems in the 2008 report. Outdoor air pollution causes 2.1 to 4.21 million dead every year. Collectively, air pollution causes the deaths of approximately 7 million people worldwide each year and is the largest single environmental health risk in the world.
Productivity losses and degraded quality of life caused by air pollution are estimated to cost the world economy $50 trillion annually. Various pollution control technologies and strategies are available to reduce air pollution.
The causes of air pollution can be divided into natural or man-made. Given the great variety of substances present in the atmosphere, numerous classification methods have been proposed: in the first place, it can be classified according to the chemical composition, so we are mainly talking about compounds that contain sulphur, compounds that contain nitrogen, compounds that contain carbon and halogen compounds.
Secondly, it can be classified according to the physical state: gaseous, liquid or solid; finally it can be divided according to the degree of reactivity in the atmosphere, into primary or secondary substances. The Impact of Air Quality on Cardiovascular Disease in Shanghai study, published in the Journal of healthcare engineering, told: "Air pollution is an important factor threatening human health.
Inhalation of pollutants can cause damage to the cardiovascular system, leading to increased morbidity and mortality of cardiovascular diseases. This paper selects six pollution factors stipulated by the national air quality standards, collects the air quality index data of Shanghai from 2014 to 2017 and the emergency data of cardiovascular disease in a tertiary hospital in the city during the same period, and conducts relevant analysis to explore different air quality conditions, characteristics, and the relationship between pollutants and cardiovascular disease visits.
The results show that the seasonal changes of major air pollutants are related to the incidence of cardiovascular disease."