What is the primary health hazard posed by radon as an indoor pollutant?

By what means does activated charcoal decolorize dye in wastewater? How does activated charcoal work?

Discuss the five analytical methods by which the air pollutants are analysed. Each method should be discussed for the basic working principle and example of air pollutants that can be analysed with that method.

Indicate at least three factors (structures) that contribute to the building's heating and cooling loss.