Which action is a corrective action for poor ventilation?

• A. Paint walls a darker color.
• B. Keep windows closed to conserve energy.
• C. Upgrade HVAC and install fume extraction.
• D. Improve ventilation and implement fume extraction.

Answer: (D)

Corrective actions for poor ventilation focus on increasing air exchange and removing airborne contaminants. The best choice combines improving ventilation with implementing fume extraction, because it directly increases fresh air flow while also pulling fumes away from the breathing zone. This addresses the problem on two fronts: diluting indoor contaminants and actively removing them at the source, which is exactly what’s needed when air quality is deficient. Painting walls darker doesn’t affect airflow or contaminant removal. Keeping windows closed reduces ventilation and worsens the issue. Upgrading HVAC and adding fume extraction does address air quality, but the phrasing that emphasizes both improving ventilation and implementing fume extraction best reflects a complete corrective action.