Nitrogen compounds eat away at stones. Crops are damaged by acid rains dependent upon species, temperature, humidity, soil, etc. Politics Industry vs jobs vs imports vs restrictions vs poor vs industrialists. Damage to airways and lungs. Natural protection in airways mucous lining trachea, bonchi and bronchioles Cilia of these tubes push mucous and trapped materials upward and out of lungs.
Turbinate bones cause air to swirl and throw particles into the mucous.
Gases in the lungs have free access to the blood. Carbon monoxide, etc. Radiation dangers - see other handout.