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Question

The components of air which are harmful to living beings are:

This question was previously asked in
HTET 2025 Level 1 PRT Question Paper (5-Jul-2026)
The correct answer is

dust and smoke

Dust and smoke are the components of air that are considered harmful to living beings, as they carry fine particulate matter and pollutant gases that can irritate the respiratory system and cause disease. Water vapour, nitrogen and carbon dioxide are natural constituents of clean air in normal concentrations.

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