Motor Vehicle Exhaust In Shenzhen And The Research Of Its Influence To The Atmospheric Environment Quality

With the high speed development of the Shenzhen special economic zone, the motor vehicles number increased every year approximately 20%, at present, the vehicles numbers are nearly 400,000, Shenzhen atmospheric environment quality has been influenced by the motor vehicle exhaust and is serious at present. Shenzhen motor vehicles numbers change very obviously in different road section, motor vehicles flow magnitude distribution is not average in the typical transportation skeleton line each for the all kind of type traffic vehicals, the passenger vehicle flow numbers is the most for each kind of type paths, and appears the double peak value distribution, and the total traffic vehicles also appears the double peak value distribution, the traffic vehicles peaks appears in the morning about 9: 00 and afternoon about 18: 00 respectively. The vehicles pollutions exhaust quality is relation with the flow numbers of the cart, dolly and motorcycle and road length and average running speed in different roads. The inner insert method and extrapolation method are applied to establish the NOx discharge factor D of Shenzhen city in different average running speeds, and the each kind of large cart proportion and the diesel car, the gasoline motorcar weighted average weight is calculated in the different travel region each kind of path. As a whole, the discharge level of the city vehicle is very high under actual movement condition, and the single vehicals pollution factor discharge level is quite high, and is equal to the developed country discharges factor several times in the present. In the process of the NOx discharge for the Shenzhen city, the discharge quality of the heavy-duty diesel oil vehicle and heavy-duty gas oil vehicle is proportion to 40.5%, light-duty vehicle discharge quality is proportion to 25%, medium-sized vehicle discharge quality is proportion to 17%, the motorcycle discharge quality is proportion to 2.5%. The NOx discharge quality is controlled by the qualities of light-duty vehicle, heavy-duty vehicle gas and heavr-duty diesel oil and medium-sized vehicle qualities. But the most distribution of CO discharge quality is saloon car, the proportion reached to 52%, other light-duty vehicles discharge quality reached to 24%, the motorcycle total discharge quality is very little proportion, but the single vehicle discharge proportion is very high, so the light-duty vehicles is very important for the CO discharge quality controlling, all the vehicles types should be considered for the NOx controlling.For the NOx pollution, the LUOHU section discharge quality is most, the FUTIAN section is second, and then the YANTIAN section is third. for the CO and THC, the situation is the same as the NOx. And then the Shenzhen city motor vehicles running mileage and discharge are calculated, so the calculation result showed that the motor vehicles pollution discharge qualities are as follows, the NOx is 4.6 t, the CO is 7.25 t, partical matters are 0.42 t, and the HC is 1.32t. For the NOx, CO and THC, the former three location is LUOHU section, FUTIAN section and YANTIAN section. According to the monitor data, the major pollution NOx appears only 6 day in 2000, and appears 10 days in 2001, and appears 17 days in 2003, appears 48 days in 2004, so the NOx pollution problem is serious year and year, the Air pollution Index API average value is increased year and year.