Think of air pollution and automobiles or cars come into a person's mind first. The truth is, cars are not the major reason for air pollution in Delhi. A Study shows that road dust is the major reason, which has particles called PM 2.5, which accounts to 35 percent of air pollution.
The study was conducted by IIT Kanpur, and according to them, the particle known as PM 2.5 is the major cause of air pollution which is mainly found in dust, followed by vehicles, domestic cooking, power plants, and industries.
Off the vehicles, trucks and two-wheelers account for more pollution or PM 2.5 particles that passenger cars. The biggest contributor to PM 2.5 particles that pollute the air is construction and road dust. Also, the vehicle that pollutes the air most are trucks.
The weather also plays a big role in the amount of pollution. During summer, the dust level increases, while during winter, more PM 2.5 particles are emitted from additional biomass used for cooking. There is usually a 10 percent variation with vehicle pollution during summer and winter, since pollution caused during winter is because of vehicles than dust.
This study made by IIT Kanpur was commissioned by the state government in 2013, and is one of the cause for the state government to address the pollution crisis in the capital.