Car burning PM2.5 to reduce haze? Experimental results vary widely

The idle PM2.5 reached the highest value 600 recently, the haze has become a hot word in Chongqing circle of friends, a car from a web video has become hotspot of experimental test in Beijing haze days, will air detector into a car exhaust pipe, PM2.5 readings from more than and 300 to more than and 40, the final conclusion the car will be: PM2.5 = 300 in atmospheric engine, excluding the value of PM2.5...