Whilst improved air quality in cities is welcome, despite this Guardian article saying the Clean Air Zones has saved the NHS money, it's worth reflecting that the study authors are less certain about their findings.
*May* could be doing some heavy lifting

https://www.theguardian.com/environment/2025/feb/07/bradford-clean-air-zone-saves-nhs-over-30000-a-month-in-first-year
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