Air quality interventions greatly outweigh their costs

Clean air zones, street washing and speed restrictions are both effective health measures and economically justified, according to health body NICE

The guidance cautions that urban trees may not always benefit air quality. Photograph: Sheeler/123RFThe benefits to public health of restricting speed limits on urban motorways, implementing clean air zones and building off-road cycle paths far outweigh their implementation costs, according to draft government guidance.

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