A likely result of the mixing of pollutants with water vapor is acid rain.
Acid rain is the rain containing acids that forms when pollutants (harmful gases) combines with water vapor in the atmosphere. Acid rain can result from natural sources such as volcanoes or by human activities such as fossil fuel combustion which releases sulfur dioxide and nitrogen oxides into the atmosphere. When the harmful gases are released to the atmosphere, they mix with water, oxygen and other chemicals to form acidic compounds which are later released as acid rain.
