Question to the Department of Health and Social Care:

To ask the Secretary of State for Health and Social Care, pursuant to the Answer of 9 May 2023 to Question 183300 on Air Pollution: Death, what the evidential basis is for his Department's calculation of the fraction of mortality attributable to particulate air pollution since the overall number of attributable deaths is not available.

An estimate of deaths attributable to long-term exposure to air pollution can be made by multiplying the fraction of mortality attributable to air pollution by the total number of deaths annually. The fraction of mortality attributable to particulate air pollution is estimated through the adjustment of the unit relative risk factor (1.08), recommended for use in quantifying mortality associated with long-term exposure to fine particulate matter (COMEAP, 2022), to the air pollution levels.