Smog changes color between winter and summer due to the difference in the composition of the atmospheric pollutants present in the air during these seasons. In winter, smog contains a higher level of particulate matter such as sulfur dioxide, nitrogen oxides, and carbon monoxide, which are produced by the burning of fossil fuels for heating purposes. These pollutants tend to scatter light and make the air appear hazy or grayish.
In contrast, during the summer, photochemical smog forms due to the increased levels of sunlight and heat which promote the reaction of nitrogen oxides and volatile organic compounds (VOCs) emitted from automobiles and industrial sources. These reactions produce ground-level ozone and other secondary pollutants that give the smog a brownish or yellowish color.
Therefore, the color of smog changes between winter and summer due to variations in the type and concentration of pollutants present in the air.
be able to explain why smog changes color between winter and summer
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