How much does the motor vehicle have an impact on the air? How to deal with the foggy air outside the window when driving? On the 9th, Jinan Tianqiao traffic police passed a series of experiments to verify the exhaust emissions of vehicles and the concentration of pm2.5, vehicle conditions and driving. The relationship between status and pm2.5 emissions reminds us how to reduce air pollution and reduce the harm to us.
Before the experiment, the traffic police involved in the experiment first explained to the reporter a concept, that is, the pm2.5 value, its unit is milligrams per cubic meter, such as pm2.5 value of 100, meaning That is, 1 cubic meter of air contains 100 milligrams of pm2.5 contaminants. The pm2.5 value is from low to high, which is roughly the same: 0 to 35 air quality is excellent, 35 to 75 is good, 75 to 115 is mild pollution, 115 to 150 is moderate pollution, 150 to 250 is Heavy pollution, more than 250 is a serious pollution.
What is the relationship between vehicle exhaust emissions and pm2.5 in the air? At 7:30 on the morning of the 9th, the traffic peaks, the Jinan Tianqiao traffic police carries the pm2.5 detection instrument SDM805 cloud measuring instrument, which has been in the traffic-intensive Jinan long-distance bus. On-site inspection at the intersection of the terminus, near the East Industrial and Commercial River on the road and in a closed community nearby.
The test results show that the pm2.5 value near the long-distance bus terminal is about 120, the east industrial riverside is 110, and the closed jade county is about 95. That is to say, the air in the closed Jade County is slightly polluted, and the pollution near the long-distance bus terminal has reached a level.
Liu Yiping, a staff member who operates the test instrument for testing, said that the change in pm2.5 value is affected by wind direction, air humidity, etc., and the value will change as the environment changes.
“In the vicinity of the long-distance station, the highest value can reach 140.†Liu Yiping said that analyzing the three data, although it is still impossible to calculate the proportion of vehicle exhaust gas to pm2.5, but the data can be compared to prove the vehicle exhaust emissions and pm2 .5 has a great relationship. In the place where the traffic volume is large, the value of pm2.5 is large, while in the closed community, although it is also in the urban area, pm2.5 is much smaller because there are few motor vehicles in the vicinity.
"From this point of view, we also recommend that the public should try to avoid the peak of traffic early and evening, avoiding the intersections and sections where the vehicles are concentrated," Liu Yiping said.
When the throttle is stepped on, the surrounding horse is seriously polluted. The vehicle stops driving. When the red light is at the intersection, will the pm2.5 in the exhaust gas increase?
In this regard, the Tianqiao traffic police also conducted an experiment. In the yard of the Tianqiao Traffic Police Brigade, the instrument showed a pm2.5 value of 100, and the instrument was taken to a car that stopped driving but did not turn off, and the value of pm2.5 increased. However, only two or three points have been added. After many tests, this is the result.
“Prove that there is no significant increase in the pm2.5 emissions when the vehicle is idling,†Liu Yiping said.
The experimental results show that the motor vehicle emissions pm2.5 will increase significantly when the throttle is activated. When the traffic police tested a new car, it was found that when stepping on the throttle, the pm2.5 value was as high as 400 and the highest was 500, which had reached a serious level of pollution.
This situation is particularly prominent in old vehicles. When testing a 10-year-old Santana, the pm2.5 was as high as 570, 580 and even reached 700 at the time of stepping on the gas pedal.
When testing a bus that was randomly stopped by the traffic police, it was found that the pm2.5 near the exhaust pipe was as high as 310, which was much higher than the value of the car (200).
"It can be said that the larger the displacement of the vehicle, the worse the condition of the vehicle, and the higher the amount of pm2.5 discharged." Chen Sheng, deputy head of the Tianqiao Traffic Police Brigade.
Do not open the smoky sky car. Air conditioning outside the cycle. Driving in the foggy days, will the window be closed to block the effect of pm2.5? In this regard, Liu Yiping said that they have also carried out experimental verification.
The experimental results show that there are two situations in the end. If the air conditioning is turned on during driving, the air inside the vehicle can be exchanged with the outside of the vehicle, and there is no significant difference in the pm2.5 inside the vehicle.
In the case of turning on the inner circulation of the air conditioner, the value of pm2.5 in the car is obviously smaller than that outside the car. "If the car is 100, the car will be around 30."
In view of this, Liu Yiping suggested that the owner, if driving in the fog, it is best to close the window, turn on the air conditioning cycle or not open the air conditioner.
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