Which of the following statements is true about photochemical smog?....
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Which of the following statements is true about
\( \mathrm{P} \)
photochemical smog?
(1) It is reducing in nature
(2) It is formed in winter
(3) It is a sulphurous smog
(4) Components of the smog, \( \mathrm{NO} \) and \( \mathrm{O}_{3} \), irritate the nose and throat and their high concentration causes headache, chest pain, dryness of the throat, cough and difficulty in breathing.
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