Photochemical smog is a type of air pollution that is predominantly found in urban and industrial areas. It is formed when pollutants emitted by vehicles and industrial emissions react with sunlight. Let's delve into the explanation:
Photochemical smog primarily consists of nitrogen oxides (NO_x) and volatile organic compounds (VOCs) that are produced from burning fossil fuels. When these chemicals undergo photochemical reactions in the presence of sunlight, they form ozone and other secondary pollutants.
This type of smog is typically associated with high levels of traffic and industrial activities, which are the main sources of the precursor pollutants. Industrial areas are inherently likely to have higher emissions due to the concentration of vehicles and industrial processes.
The options need to be evaluated based on these conditions:
Industrial area: Correct answer, as industrial areas are where emissions from vehicles and industries are high, promoting the formation of photochemical smog.
Marshy place: Incorrect, since marshy areas are not typically associated with high levels of vehicular or industrial activity.
Hilly area of Himachal: Incorrect, as hilly or rural areas generally have lower vehicular and industrial pollution compared to urban or industrialized regions.
Cold humid climate: Incorrect, because cold climates generally result in lower levels of the photochemical reaction needed for smog formation. Smog formation is more prevalent in warm, sunny climates.
Hence, the most suitable environment for the formation of photochemical smog is indeed an Industrial area, making it the correct answer. Always remember that photochemical smog is closely linked to pollution created by modern life in the city thanks to large volumes of traffic and industrial emissions.
