Population-weighted concentrations of PM10 and O3 in urban agglomerations of more than 250 000 inhabitants in EU-27

Urban air quality is of major concern. The high density of population and of economic activities in urban areas results in increased emissions, ambient concentrations and exposure. The Structural Indicator for urban air quality is presented which comprises two sub-elements describing the annual variations in population weighted health-relevant concentrations of (1) ozone and (2) particulate matter (PM10) in ambient air in urban areas.