The Economics of Clean Air: Checkpoint 1

Quick checkpoint - five questions on pollution sources, PM2.5, Delhi's smog, stubble burning and AQI.

Quick checkpoint - five questions on pollution sources, PM2.5, Delhi’s smog, stubble burning and AQI.

Question 1 of 5 Why is pollution a negative externality?

Polluters don't pay for harm to others It's always cheap to clean Everyone chooses to breathe it It has no costs

Others bear the costs.

Question 2 of 5 What is WHO's annual PM2.5 guideline?

5 micrograms per cubic metre 40 100 500

India's national standard is 40.

Question 3 of 5 Why does Delhi's air worsen in winter?

Cold still air traps pollution, plus stubble smoke More rain Fewer cars Factories close

Temperature inversions trap pollution.

Question 4 of 5 Why do many farmers burn stubble?

A short window between crops and low cost It's required by law It improves soil a lot Machines are free everywhere

A 2009 groundwater law shortened the window.

Question 5 of 5 When did India launch its national AQI?

2015 1990 2023 1970

It combines several pollutants.

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