PMT 116N Environmental Health And Safety (EHS) Practice Test

Improving indoor air quality works best when you tackle pollutants on three fronts: control their source, bring in fresh outdoor air to dilute what’s inside, and remove particles with filtration. This combination—adequate ventilation, source control, and filtration—addresses where contaminants come from, how they accumulate, and how they are removed from the air. By reducing emissions at the source, you lower the total amount of pollutants entering the space. Adequate ventilation ensures a steady replacement of indoor air with outdoor air, diluting any contaminants that are present. Filtration then captures particles and some aerosols, further lowering what you breathe. The other options don’t provide this comprehensive approach. Focusing on humidity or temperature alone doesn’t reduce pollutant sources or ensure air exchange. Humidity control helps with mold risk but doesn’t remove VOCs or other contaminants. Reducing sunlight exposure isn’t a standard, reliable method for improving IAQ.