Question

Which of the following is the most toxic air pollutant?

• A. Arsenic
• B. Asbestos
• C. Benzene
• D. Potassium chloride

Hint:

Asbestos fibers are extremely dangerous when inhaled—linked to lung diseases and cancers, making it a highly toxic air pollutant.

Answer 1

The Correct Option is B

Concept: Air pollutants are assessed based on their ability to enter the respiratory system and cause long-term damage to human tissues, especially the lungs. Step 1:Examine the nature of airborne exposure.
Particles or fibers that remain suspended in air and can be deeply inhaled into lung tissues pose the highest risk because they bypass natural defense mechanisms.
Step 2:Compare health impacts of each substance.

• Asbestos → Fibrous material that penetrates deep into lungs and remains lodged, causing chronic and fatal diseases
• Arsenic → Toxic element, but primarily associated with water and soil contamination
• Benzene → Volatile organic compound with toxicity, but less persistent fibrous damage in lungs
• Potassium chloride → Non-toxic in this context and not an air pollutant

Step 3:Identify most hazardous airborne pollutant.
Among the given substances, the fibrous nature and irreversible respiratory damage make one option the most severe air pollutant.