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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: Atmos Environ (1994). 2014 Nov 1;97:336–345. doi: 10.1016/j.atmosenv.2014.08.027

Table 2. Mean/median pollutant concentration among primary studies.

Full gestational period Trimester 1 Trimester 2 Trimester 3
CO
(ppm)		 NO2
(ppb)		 O3
(ppb)		 PM2.5
(μg/m3)		 PM10
(μg/m3)		 CO
(ppm)		 NO2
(ppb)		 O3
(ppb)		 PM2.5
(μg/m3)		 PM10
(μg/m3)		 CO
(ppm)		 NO2
(ppb)		 O3
(ppb) -		 PM2.5
(μg/m3)		 PM10
(μg/m3)		 CO
(ppm)		 NO2
(ppb)		 O3
(ppb)		 PM2.5
(μg/m3)		 PM10
(μg/m3)
Dadvand et al. 2013 - 29.6 - 16.5 39.0 - 30.2 - 17.0 41.2 - 30.9 - 17.3 41.7 - 30.7 - 17.3 41.3
Lee et al. 2013 - - - - - - - 21.7 15.6 24.8 - - - - - - - - - -
Mobasher et al. 2013 - - - - - 0.58 28.6 21.5 17.0 34.5 0.7 30.0 18.2 17.5 34.9 0.6 30.0 18.2 18.1 35.1
Olsson et al. 2013 - - - - - - - 34.0 - - - - - - - - - - - -
Pereira et al. 2013 - - - - - - - - - - - - - - - - - - - -
van den Hooven et al. 2011 - 21.2 - - 30.3 - 21.5 - - 30.9 - - - - - - - - - -
Vinikoor-Imler et al. 2012 - - - 14.5 22.2 - - - - - - - - - - - - - - -
Wu et al. 2011 (Los Angeles) 0.9 29.8 30.1 18.8 34.5 - - - - - - - - - - - - - - -
Wu et al. 2011 (Orange County) 0.6 20.4 40.5 16.0 31.1 - - - - - - - - - - - - - - -
Xu et al. 2013 0.6 27.8 40.0 10.3 - 0.6 28.0 40.0 10.1 - 0.6 27.9 41.0 10.2 - - - - - -
Zhai et al. 2012 0.3 - - - - - - - - - - - - - - - - - - -