Table 1

Description of the four counties in the study area

CountyEventsCohort sizePerson-time (years)Events per 1000 personsAnnual mean NO2 50th, 5th–95th percentile (µg/m3)Annual mean PM10 50th, 5th–95th percentile (µg/m3)
Stockholm7346360 6831 235 01820.48.3 (3.7–21.5)8.7 (3.8–21.5)
Västra Götaland6004270 398948 03522.27.7 (3.1–24.8)14.2 (9.4–24.8)
Skåne4248218 064758 50419.57.4 (4.0–23.1)15.8 (11.2–33.5)
Västerbotten107746 972165 59922.92.3 (0.8–15.5)5.7 (3.6–9.0)