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the claim

Decreasing urban speed limits from 50 km/h to 30 km/h increases air pollution

the verdict

REFUTED

the evidence says no

confidence 20/100

The available scientific evidence directly contradicts the claim, demonstrating instead that lowering urban speed limits from 50 km/h to 30 km/h improves fuel efficiency and reduces air pollution and greenhouse gas emissions.

Evidence against · 2

Review of City-Wide 30 km/h Speed Limit Benefits in Europe

2024 · cited by 47

This systematic review of European cities found that implementing 30 km/h speed limits yielded environmental benefits, with emissions decreasing on average by 18% and fuel consumption by 7%.

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More against · 1

Reduction of GHG Emissions: Air Quality Improvement in Urban Areas

2024 · cited by 2

This study concludes that a reduction in vehicle speed improves engine combustion and reduces gas emissions by 27.5%.

The paper trail · every fact has a biography

first checked01 Aug 2026

judged → REFUTED · 2001 Aug 2026

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