Ministry of Environmental Protection: Motor vehicle pollution has become an important source of air pollution
The Ministry of Environmental Protection recently released a report that China has become the world's largest country in the production and sale of motor vehicles for eight consecutive years. Motor vehicle pollution has become an important source of air pollution in China. The urgency of this is becoming increasingly prominent.
The Ministry of Environmental Protection issued the "Annual Report on the Environmental Management of Motor Vehicles in China (2017)", which announced the national environmental management of motor vehicles in 2016. According to the annual report statistics, China's motor vehicle ownership continues to grow. In 2016, the number of motor vehicles in the country reached 295 million, an increase of 8.1% over 2015, of which the number of new energy vehicles reached 1.014 million.
Liu Bingjiang, director of the Department of Atmospheric Environment Management of the Ministry of Environmental Protection, said that with the rapid increase in vehicle ownership, the air in some cities in China has begun to exhibit the characteristics of combined pollution of soot and motor vehicle exhaust, which directly affects residents' health. The analysis results of atmospheric fine particulate matter (PM2.5) sources in 15 cities including Beijing, Tianjin, and Shanghai show that the contribution of mobile sources in local emission sources to the fine particulate matter concentration ranges from 13.5% to 41%.
Liu Bingjiang said that in 2016, the preliminary accounting of pollutants emitted by motor vehicles nationwide was 44.725 million tons, a 1.3% reduction from 2015. Among them, carbon monoxide (CO) was 34.193 million tons, hydrocarbons (HC) were 4.22 million tons, nitrogen oxides (NOx) were 5.778 million tons, and particulate matter (PM) was 534,000 tons.
Automobiles are the main contributors to the total amount of pollutants emitted by motor vehicles. Their emissions of CO and HC exceed 80% and NOx and PM exceed 90%. Among them, the national and second-tier cars with a proportion of only 12.8% of the total amount of CO, HC, NOx, and PM emissions accounted for 60.7%, 60.6%, 43.6%, and 67.1%.
Classified by vehicle type, the NOx and PM emissions of trucks nationwide are significantly higher than those of passenger cars, of which heavy trucks are the main contributors; and the emissions of CO and HC from passenger cars are significantly higher than those of trucks. According to fuel classification, the NOx emitted by diesel vehicles nationwide is close to 70% of total vehicle emissions, and PM exceeds 90%.
In addition, the contribution of non-road mobile source emissions to air quality cannot be ignored. Liu Bingjiang said that in 2015, there were 6.908 million units of construction machinery, 89.783 million kilowatts of agricultural machinery diesel, 166,000 ships, and 8.566 million aircraft movements. These non-road mobile sources emit 844,000 tons of sulfur dioxide (SO2), 704,000 tons of hydrocarbons HC, 560,000 tons of nitrogen oxides, and 472,000 tons of PM. Among them, NOx and PM emissions are close to motor vehicles.
Follow-up: Why pay attention to motor vehicle pollution? Motor vehicle pollution is an important source of air pollution
According to the Gazette, in 2016, the provinces with a large number of motor vehicles were concentrated in the eastern region. The top five provinces were Shandong, Guangdong, Henan, Hebei, and Jiangsu, all of which were around 15 million. The number of motor vehicles is ranked 14th.
Motor vehicle pollution has become an important source of air pollution in China and an important cause of fine particle and photochemical smog pollution. In large cities such as Beijing and Shanghai and densely populated areas in the east, the contribution of mobile sources to PM2.5 is as high as 20% to 40%. Under extremely unfavorable conditions, the contribution rate may even exceed 50%. At the same time, as most vehicles are in densely populated areas, exhaust emissions directly threaten public health.
According to estimates, in the next five years, China will add more than 100 million motor vehicles, more than 1.6 million construction machinery, and 100 to 150 million tons of gasoline and diesel for vehicles. The resulting atmospheric pressure will be huge.
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