How can you improve indoor air quality? A. keeping pets indoors as much as possible B. using darker paint on all interior walls C. installing sunscreens on all windows D. Increasing ventilation in enclosed spaces

## Step 1<br />The problem is asking for the best method to improve indoor air quality. We need to evaluate each option based on its potential to enhance indoor air quality.<br /><br />## Step 2<br />Option A suggests keeping pets indoors as much as possible. However, pets can shed hair and dander, which can contribute to indoor air pollution. Therefore, this option is not a good way to improve indoor air quality.<br /><br />## Step 3<br />Option B suggests using darker paint on all interior walls. The color of the paint does not have a significant impact on indoor air quality. Therefore, this option is not a good way to improve indoor air quality.<br /><br />## Step 4<br />Option C suggests installing sunscreens on all windows. While sunscreens can help reduce the amount of sunlight entering a room, they do not directly improve indoor air quality. Therefore, this option is not a good way to improve indoor air quality.<br /><br />## Step 5<br />Option D suggests increasing ventilation in enclosed spaces. This is a proven method to improve indoor air quality. By increasing ventilation, we can reduce the concentration of indoor pollutants and bring in fresh air from outside.