Key term for OCR GCSE History B, used in Britain since c. 1900.
Tiny particles from vehicle exhausts that are less than 2.5 micrometres in size and can penetrate deep into the lungs and bloodstream.
Particulate matter (PM₂.₅) appears in OCR GCSE History B revision content for The People’s Health (c.1250–Present), especially Britain since c. 1900 and Living conditions and lifestyles.
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