The air is pure and fresh in _________. 

Clean air is air that doesn't include any hazardous contaminants (such as dirt and chemicals). It is healthy for people to breathe clean air. The air can feel heavy and smell awful on a hot day with no wind. The air can occasionally even cause your chest to feel tight or cause you to cough. Due to minimal pollution levels and no release of toxic gases from their means of transportation, which is typically a bicycle or a bullock cart, the air is clean and fresh. Pollution is reported to occur more frequently in cities than in villages. The following are the causes for this: The population is higher in cities than in villages. Pollution increases as the population grows. Therefore, option A is the right answer for the above question.