Question

which of the following is the most common source of indoor air pollutants in less - developed countries? poorly ventilated cooking fires cleaning solvents carbon monoxide from vehicles air - conditioning units

Explanation:

In less - developed countries, many households use traditional cooking methods with fires (like wood - burning stoves) that are poorly ventilated. These fires release pollutants such as particulate matter, carbon monoxide, etc. into the indoor air. Cleaning solvents, carbon monoxide from vehicles (which is more of an outdoor or garage - related indoor issue in some cases), and air - conditioning units are not as common a source of indoor air pollutants in less - developed countries as poorly ventilated cooking fires.

Answer:

poorly ventilated cooking fires