Table 2. Mean concentrations of NO₂ and PM₁₀ (in μg/m³) and standard deviations during four windows of exposure: Entire pregnancy and first (T1), second (T2) and third (T3) trimesters of pregnancy.

	Mean	Standard deviation
NO2 (μg/m3)
Entire pregnancy	52.7	7,8
T1	53.0	10,5
T2	52.8	10,8
T3	52.4	10,8
PM10 (μg/m3)
Entire pregnancy	29.9	2,5
T1	30,1	4,3
T2	29,8	4,5
T3	29,5	4,4