Maternal exposure to air pollution before and during pregnancy related to changes in newborn's cord blood lymphocyte subpopulations. The EDEN study cohort

Table 5 Maternal exposure to background pollutants and BETX

	Total study sample		Non-smoking mothers with BETX assessment
Mean ± SD (μg/m³)	NO₂	PM₁₀	Benzene	Toluene	Ethylbenzene	Xylenes*
Window of exposure time	n = 370		n = 56
Before pregnancy
3 months bf	27.6 ± 13.0	22.0 ± 6.7
During pregnancy
1^st trimester	28.2 ± 12.7	21.8 ± 5.8
2^nd trimester	28.2 ± 11.3	21.8 ± 5.2	3.3 ± 2.0	41.5 ± 16.5	5.1 ± 2.0	23.3 ± 8.7
3^rd trimester	26.7 ± 12.1	21.9 ± 6.4

* Sum of o-xylene, m-xylene and p-xylene. SD, standard deviation; bf, before; BETX, benzene, ethylbenzene, toluene, xylenes.

ISSN: 1471-2393