Table 2.

LUR-modelled air pollution exposure using residential address at time of birth: exposure during the whole pregnancy and by trimester

	Oslo n=4 669	Akershus n=7 554	Bergen n=3 869	Hordaland n=1 441	Total n=17 533
Mean LUR-modelled NO2 exposure (µg/m3)
Whole pregnancy	21.6±4.4	10.3±3.8	13.2±6.2	6.3±4.3	13.6±6.9
Trimester 1	21.7±6.1	10.2±4.2	13.4±6.4	6.5±4.4	13.7±7.4
Trimester 2	22.0±6.1	10.4±4.3	13.3±6.5	6.3±4.3	13.8±7.5
Trimester 3	21.5±6.1	10.3±4.2	13.1±6.3	6.3±4.3	13.6±7.3

Numbers are mean±SD deviation.

European Union air quality standard for NO₂: 1-year average 40 µg/m³.

LUR, land use regression.