Freakonomics Radio

Snapshot · Freakonomics Radio

This Is Your Brain on Pollution (Update)

Explore episode Jun 10, 2026

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Path Dependence: How Historical Pollution Still Shapes Cities Today

At 19:22 · chapter starts 19:10

The most troubling finding from Hiblik's 'East Side Story' research isn't the historical sorting — it's that the sorting has intensified over time. One standard deviation more historical pollution corresponds to a 20% higher share of low-skilled workers in a neighborhood today, compared to 15% in the Victorian era. Hiblik explains this through path dependence: pollution drew the poor east, then highways cut off the east side, school funding fell, building quality declined, and crime rose — each factor reinforcing the last in a classic snowball effect. Test scores in historically high-pollution east sides are lower, and crime rates are higher. The causal question remains open: did pollution impair cognition directly, or did it simply sort lower-income people into those areas? That question is exactly what the next section of the episode sets out to resolve.

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