India and Pakistan dominate WHO’s air pollution database

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The region contains 16 of the world’s 20 most polluted cities. Historical data sheds light on why

At this time of year, agricultural burning adds to the air pollution problems across northern India and Pakistan. The region contains 16 of the 20 most polluted cities in the World Health Organization’s global PM2.5 database. But are these the most polluted places ever recorded? Lack of measurements make historic comparisons difficult, but we have some clues.

More than 200 years ago, Benjamin Franklin was famously among the first scientists to study electricity in the atmosphere. Lightning is the most obvious manifestation, but air pollution also changes the electrical properties of our air.

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