In a city the air can be worse or better depending on the season. I too had dry cough in winter in a city where smog would form during winter because the wind d

In a city the air can be worse or better depending on the season. I too had dry cough in winter in a city where smog would form during winter because the wind did not blow during that time of the year. When I moved to another city the dry-cough disappeared even though it was winter, in this city the wind was not stagnant in the winter, presumably carrying away polluted air form automobiles.