How much does urban road traffic contribute to environmental pollution?

The contribution rate of urban road traffic to environmental pollution should also be very large, and he should account for 70 or 80 percent of environmental pollution.

I don't know what you're referring to, if it's car exhaust to the air pollution is actually not big, the air pollution is mainly factories, for example, Hangzhou 16 years during the G20, the air quality is good, the blue sky and white clouds, even the night sky is good, but Hangzhou still has a lot of cars driving, why, because during the G20 period, Shanghai Jiaxing, most of the factories have stopped, especially Shanghai's thermal power plants, Hangzhou industry is not much, Hangzhou's air pollution is blown from Shanghai Jiaxing.

Exhaust gases from transportation are important traffic pollutants. In particular, the amount of cars in the city is large and concentrated, and the pollutants emitted can directly invade people's respiratory organs, which is very harmful to human health. Therefore, traffic pollution is very serious to the air pollution of the city, and it has become one of the main sources of air pollution in large cities.

The exhaust gases emitted by automobiles mainly include carbon monoxide, sulfur dioxide, nitrogen oxides and hydrocarbons, and the first three substances are very harmful.

Exhaust pollution is closely related to vehicle flow, vehicle type, fuel, operating status, road conditions and geography and meteorology. It changes randomly in different seasons and times.

In the monitoring of different regions of China, it has been found that among the pollutants in the ambient air, vehicle emissions account for a serious share rate, of which CO, NOX, HC and other contents account for about 80% and 90%. As the number of vehicles in China has increased by more than 15% annually in recent years, the emissions of the above pollutants will also rise. Obviously, vehicle emissions will become one of the main sources of ambient air pollution in our country.

In the airspace near the highway, there are often high concentrations and long-lasting pollutant discharge areas, which are harmful to human health, and will also have a serious impact on animals, plants, water and soil environments. China's roads and vehicles are in the early stage of development, grasping this key issue, controlling traffic emission pollutants, so that road traffic development should meet the requirements of the ecological environment, and coordinate with the environment, is undoubtedly one of the conditions for sustainable development strategy. (1) Harm to plants.

Air pollutants, especially sulfur dioxide and fluoride, are very harmful to plants. When the concentration of pollutants is very high, it will cause acute harm to plants, causing lesions on the surface of plant leaves, or directly causing the leaves to wither and fall off; When the concentration of pollutants is not high, it will cause chronic harm to plants, making plant leaves green, or there are no harmful symptoms on the surface, but the physiological function of plants has been affected, resulting in a decline in plant yield and deterioration of quality.

2) Impact on weather and climate.

The impact of air pollutants on weather and climate is significant. The large amount of soot particles emitted makes the air very turbid, blocking the sunlight and reducing the amount of solar radiation reaching the ground, which is nearly 40% less than on days without smoke. Cities with severe air pollution, which happens every day, will cause people and animals to grow poorly due to lack of sunlight.

3) Increase the temperature of the atmosphere.

In the skies over large industrial cities, the air near the ground is warmer than in the surrounding suburbs because of the large amount of waste heat emitted into the air. This phenomenon is known in meteorology as the heat island effect.

Traffic pollution refers to the pollution of road traffic refers to the smoke, dust and harmful gases emitted by vehicles, the quantity, concentration and duration of which exceed the natural purification capacity and allowable standards of the atmosphere, causing people and organisms to suffer from them.