The most relevant effect of particulate matter in air on human health is

AImpaired blood formation

BAggravation of respiratory disease ✓ Correct

CChest tightness

DHeadache and a rise in blood pressure level

Correct answer: (B) Aggravation of respiratory disease

Explanation

The most significant health effect of airborne particulate matter is the worsening of respiratory disease.

Impaired blood formation is more typical of lead exposure than of particulates.

Chest tightness is a symptom rather than the principal health impact of particulates.

Headache and raised blood pressure are associated more with carbon monoxide exposure.

Fine particles penetrate deep into the lungs, aggravating asthma and bronchitis.

Particles below 2.5 micrometres are the most hazardous, reaching the alveoli.

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