How can you improve indoor air quality?

There are a variety of ways in which indoor air quality can be improved, depending on the environment that you live in and other factors in your home. Firstly, ensure that you remove any contaminants, such as mold on the walls or anything that might be giving off chemicals. Additionally, avoid behaviours such as smoking in the home which will add such chemicals to the air through the smoke. You could also invest in an air purifier. So it's D

Explanation:

you would have a std. i hope this .