Some highlights
Epidemiological research began in the early 1990. It should be pointed out that fine particles from combustion sources such as power plants and vehicles (known as PM 2.5 , or particles that are 2.5 microns or less in diameter) are to human health dangerous, as large particles outside air or typical concentration of pollutant gases such as ozone, sulfur dioxide and carbon monoxide.
- Researchers compared the air quality in six cities were astonished when their data showed that people living in cities with very dirty air, an average of two years earlier died as residents of cities with very clean air.
The difference in mortality has been associated with the high concentration of fine particle contamination.
In healthcare, a two-year shift in life expectancy is enormous, comparable to the protective effects of a proper diet and exercise, so the researchers first had doubts about their results themselves.
