Hold your breath

By Nell Boyce in Washington DC A FRESH analysis of a classic pollution study has vindicated its conclusion that city-dwellers in Europe and the US are dying young because of microscopic particles in the air. Most of the concern about particulate pollution began in 1993 with the publication of the Harvard “Six Cities” study, which identified particles with a diameter of less than 10 micrometres (PM10) as a threat to public health. A team of researchers at the Harvard School of Public Health in Boston, led by Douglas Dockery,
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