What is the brownish haze in the city come from?

Answer 1

The brownish haze in cities, often referred to as smog, primarily results from a combination of air pollutants, including particulate matter, nitrogen oxides, and volatile organic compounds. These pollutants can arise from vehicle emissions, industrial activities, and other sources. When sunlight interacts with these pollutants, it leads to the formation of ground-level ozone and secondary particulate matter, contributing to the haze. Weather conditions and temperature inversions can exacerbate the situation by trapping these pollutants close to the ground.