stop indoor air pollutants - concept image with road sign seen through a window

air asbestos bacteria biological carbon chemical cigarette concept concepts condensation contaminates dioxide domestic dust electromagnetic environmental fields formaldehyde fumes fungal germ home house household image indoor indoors interior lead len life lutants luting lution mite mold monoxide nitrogen open opened particles passive products radon road room secondhand seen sheet sign smoke smoking stale stop test text tobacco vapors window