Question

what is one of the problems with indoor air pollutants? they can easily blow away they cant build up they can build up to high concentrations they exist in small quantities

Explanation:

Indoor spaces can be relatively enclosed, allowing pollutants to accumulate over time and reach high - concentration levels which can be harmful to human health. Pollutants don't easily blow away in an indoor environment, they can build up, and the problem is not that they exist in small quantities.

Answer:

they can build up to high concentrations