Social & Preventive Medicine Indicator of air pollution are: A Sulphur dioxide, lead, paiculate matter B Carbon dioxide, hydrogen sulphide, lead C Sulphur dioxide, hydrogen sulphide, carbon monoxide D Sulphur dioxide, smoke, paiculate matter 💡 Explanation Indicator of air pollution are: ✓ Correct Answer: D. Sulphur dioxide, smoke, paiculate matter