Question

volatile organic compounds (vocs): the most ____ of indoor air pollutants; carbon - containing compounds. - released into the air in very small amounts by many products including __. - since there are __, and we are exposed to them at such low levels, it is difficult to determine exactly how voc exposure may affect our health. - an exception is ____, which can irritate the eyes, nose, throat, and skin.

Explanation:

1. For the first blank: VOCs are a major type of indoor air pollutants, so "common" fits as they are widespread.
2. Second blank: Products like paints, cleaning supplies, pesticides, etc., release VOCs. These are typical sources.
3. Third blank: There are many different VOCs (hundreds or thousands), making it hard to study their health effects due to variety and low exposure.
4. Fourth blank: Formaldehyde is a well - known VOC that irritates the eyes, nose, throat, and skin.

Answer:

1. common
2. paints, cleaning supplies, pesticides (or other relevant products)
3. so many different VOCs
4. formaldehyde