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What range of air quality index has the most severe impact on human health?

(a) 101-200

(b) 201-300

(c) 301-400

(d) 401-500

The question was posed to me in a national level competition.

This question is from Air Quality topic in portion Air Pollution of Environmental Engineering

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Best answer
Correct option is (d) 401-500

To elaborate: Air quality is regarded as severe when it has an index of 401-500, and affects even healthy people and impacts them even during simple activity.

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