Which of the following is a potential environmental impact from indoor pesticide application?

• A. Air pollution.
• B. Increased outdoor plant growth.
• C. Improved indoor air quality.
• D. Elimination of all pests.

Answer: (A)

Indoor pesticide application can release chemicals into the air, making air pollution the most likely environmental impact. Many pesticides contain volatile components or are applied as sprays or aerosols, so these compounds can become airborne and affect the quality of the air occupants breathe. These vapors and particles can linger in indoor spaces, travel to other rooms, and even exit through ventilation to contribute to outdoor air pollution. The other options don’t fit: pesticides don’t reliably boost outdoor plant growth, they don’t typically improve indoor air quality, and eliminating all pests is not realistic, though some pests may be reduced.