477 private cars per 1000 inhabitants
Source: Sveriges officiella statistik: Trafikanalys (Swedish official statistics: Transport Analysis)
https://www.trafa.se/globalassets/statistik/vagtrafik/fordon/2019/fordon...?
8-10% of children of school-age (in Sweden this is 7-16 years old) have asthma according to Barnallergisektionen.
http://www.barnallergisektionen.se/Boken/BOK_AAB.pdf