What is a common method used to assess the concentration of hazardous substances in the air?

Sampling and lab analysis is a widely recognized method for assessing the concentration of hazardous substances in the air because it allows for precise measurement and identification of contaminants. This method involves collecting air samples and then analyzing them in a laboratory setting using various techniques, such as gas chromatography or mass spectrometry. This approach not only provides quantitative data regarding the concentration of specific hazardous substances but also helps in identifying multiple compounds present in the air.

Thermal imaging, while useful for identifying heat sources and potential hazards, does not provide specific information about air quality or the presence of hazardous substances. Colorimetric analysis is a technique that can be applied in some contexts but typically focuses on detecting specific chemicals rather than general air sampling. Visual inspection can identify apparent hazards or irregularities but lacks the precision and reliability required for assessing air quality quantitatively.