monitor – v. to watch, observe, listen to, or check (something) for a special purpose over a period of time

pollutant – n. a substance that makes land, water, air, etc., dirty and not safe or suitable to use : something that causes pollution

fumes – n. smoke or gas that smells unpleasant — usually plural

asthma – n. a physical condition that makes it difficult for someone to breathe

chronic – adj. continuing or occurring again and again for a long time

bronchitis – n. an illness in which your bronchial tubes become sore or damaged and you cough a lot

premature – adj. happening too soon or earlier than usual