Speaker
Stefan Hiblik
Appearances over time
1 episodes
Episodes
1
Podcasts
Quotes & moments
Stefan Hiblik found that even holding distance to a factory chimney constant, walking along a circle around a smokestack, the east side had 1–2 percentage points more low-skilled workers.
One standard deviation increase in historical coal pollution corresponded to 15% higher share of low-skilled workers in a neighborhood in the past; today that effect has grown to 20%, suggesting path dependence.
Michael Greenstone's Air Quality Life Index calculates how much longer people would live if local pollution met WHO standards. The answer: the average person on Earth loses 2.2 years of life to dirty air.
Air pollution kills roughly 7 million people a year — more than double global COVID deaths in 2020, and more than 5 times annual car-crash fatalities. Economist Michael Greenstone says it's worse than cigarette smoking, wars, and auto accidents combined.
China's Huai River heating policy drew an arbitrary line across the country: free coal for the north, nothing for the south. Because migration was tightly controlled, this created a perfect natural experiment. People born north of the river lived 3 years less and their children completed nearly a full year less of schooling.
Researchers analyzing baseball umpires found they made more wrong calls on high-pollution days. It was the first strong evidence that air pollution impairs professional adult performance — not just students taking tests.
Linos and Severnini's most novel finding: pollution doesn't just impair attention or speed — it specifically hits memory. Sectors and jobs that depend on memory retention are likely seeing the sharpest hidden productivity losses.
The Trump administration announced that the EPA will no longer consider the health benefits of reduced pollution when setting clean air regulations. Greenstone calls it a step that will go down in history books — and predicts dirtier air for everyone and more greenhouse gas emissions.
Even when air pollution stays below EPA and WHO guidelines, cognition is measurably impaired across seven cognitive domains — including memory, attention, flexibility, and problem-solving. The biggest effects hit adults under 50.
Beijing's particulate matter levels fell from over 100 micrograms per cubic meter in 2013 to just over 50 by 2018. Greenstone estimates a child born in 2018 will live 1.4 years longer than one born in 2013 — a pace of cleanup the US never matched after its own Clean Air Act.
As coal smoke darkened English trees, the darker variety of the peppered moth thrived because it could hide from predators. Stefan Hiblik's team used the historical ratio of dark-to-light moths as a validation tool for their pollution dispersal model — a clever bridge between microevolution and economic history.
Because pollution monitors aren't strapped to individuals' bodies, measuring exact exposure is hard. Linos and Severnini solved this by using wind direction: when wind pushes pollution from other locations into an area, every resident gets roughly the same dose — making it a natural experiment in a population.
Industrial chimneys in England's Victorian cities spewed coal smoke eastward on prevailing winds, pushing poor workers to the east sides of cities. Stefan Hiblik tracked 5,000 chimney locations and census data across 70 English cities and found the sorting effect has only deepened — even after the coal is long gone.
Stephen Dubner secretly set up a Lumosity competition between Steve Levitt and Angela Duckworth to test whether pollution levels explained their scores. Levitt hit the 92nd percentile — on a day when Chicago's air was clean. New York and Philadelphia? 23 and 24 micrograms of particulate matter.
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- History 50%
- Society & Culture 50%
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