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Practice questions @ https://www.doorsteptutor.com/Exams/ Lectures on Various Subjects like Science, Social Studies and Humanities subscribe / testprep Examrace Lectures in Hindi subscribe / examracehindi For kids videos nursery to Class 5 subscribe / funprof For Science (Physics, Chemistry, Biology and Mathematics) Class 11-12 and important topics subscribe / doorsteptutor Also visit NCERT Solutions, NIOS @ https://www.flexiprep.com/ IGCSE, A & AS Level @ https://www.examtestprep.com/ Photochemical smog is a type of smog produced when ultraviolet light from the sun reacts with nitrogen oxides in the atmosphere. It is visible as a brown haze, and is most prominent during the morning and afternoon, especially in densely populated, warm cities. The largest contributor is automobiles, while coal-fired power plants and some other power plants also produce the necessary pollutants to facilitate its production. Due to its abundance in areas of warmer temperatures, photochemical smog is most common in the summer It forms in the morning when a tremendous number people are driving their vehicles to work. Nitrogen oxides produced in the car engine are introduced into the atmosphere, which may combine with water to form nitric acid or react with sunlight to produce singular oxygen atoms, which then combine with molecular oxygen to produce ozone. The nitric acid may precipitate to the Earth resulting in acid rain, or remain in the smog. Due to the direct production of it by vehicles, the smog forms over cities where many people may encounter its adverse health effects. Hotter days mean more photochemical smog, especially in the densely populated cities such as those mentioned above. As more and more urban populations arise around the globe, this problem is only expected to increase #examrace #upsc #ugcnet