The air pollution seriously deteriorates the environment, but also harms, and much, the health of people. Especially in the cities, where most of the pollutants are concentrated and most exposed is the population to its effects. Not in vain, according to the World Health Organization, every year 1.3 million people die worldwide due to urban pollution. The causes of this type of pollution are very varied, but when we talk about cities, the studies agree that the road traffic is behind a very important part of the emissions.
The effects of traffic on health range from mild discomforts such as eye or nose irritation, to respiratory or cardiovascular diseases of varying consideration that reduce life expectancy. Likewise, the noise of urban traffic has consequences on our brain that cause discomfort and psychological alterations.
Despite the fact that the automotive industry has advanced in recent years when it comes to making vehicles more respectful of the environment, these better ones are insufficient. Today, the vast majority of cars, trucks, motorcycles or buses are driven by fossil fuel combustion engines. In this process, they expel gases and contaminating particles such as carbon dioxide and monoxide, nitrogen oxide or hydrocarbons.
The problem is further aggravated in the case of diesel engines. According to the study Quality Urban Air, Health and Road Traffic, prepared by the Spanish Higher Scientific Research Center, vehicles equipped with this technology pollute four times more than gasoline because they emit much higher levels of nitrogen dioxide and particles that remain in the air.
To all this we must add other particles originated by the wear of the brakes, tires or clutch, the erosion of the asphalt, as well as the noise pollution generated by traffic.