Question

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

Explanation:

Indoor spaces are often enclosed, reducing the dilution of pollutants by fresh air. This enclosure allows pollutants to accumulate over time. For example, volatile organic compounds (VOCs) from paints or cleaning products can build up if there's insufficient ventilation. High concentrations of indoor air pollutants can lead to various health issues like respiratory problems.

Answer:

they can build up to high concentrations