Traffic pollution causes

Pollution from traffic is for children a special concern because their immune system and lungs are not fully developed when exposure begins.Air pollution is mostly due to industry in developed countries.Automobile transport is now an inherent part of our civilisation, and as it happened with many other technological advancements, the negative aspects are becoming more andmore pronounced. Pollution intake is also determined by the number of people in polluted areas, how long they stay there and what they do. The growing use of old, poorly maintained passenger cars and the use of diesel fuel have dramatically worsened air quality.
The road traffic is known to be the major contributor to the anthropogenic emissions of the "greenhouse" gas Carbon Dioxide (CO2) and it is expected that these emissions willcontinue to increase with the steadily increasing amount of traffic.Carbon dioxide (CO2) is one of the major pollutants in the atmosphere. Major sources of CO2 are fossil fuels burning and deforestation.The most severe damaging effects related to pollution from traffic can, however, be found in urban areas. It is here that the traffic density is largest and concentrations of car exhaust gases are often orders of magnitude higher than in rural areas.Traffic exhaust gases contain pollutants such as nitrogen oxides [NOx defined as the sum of nitrogen monoxide (NO) and nitrogen dioxide (NO2)], hydrocarbons, carbon monoxide (CO), and particles.The largest pollution levels occur in street canyons where dilution of car exhaust gases is significantly limited by the presence of buildings flanking the street.In a 0.5-km-wide belt along major urban highways, concentrations of nitrogen dioxide, black smoke (or soot) and ultrafine particles are markedly higher than in areas with less traffic.
In order to design effective approaches to pollution management from mobile sources, it is important to diagnose urban air pollution problems, determine the impact of mobile sources, and identify affordable and sustainable solutions.
The effects on health of transport-related air pollution are among the leading concerns about transport.
Motor vehicles are being used too much, and they are not “clean” enough when they are used.