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Table 2 Distribution of pollutant exposures averaged over length of pregnancy, as measured within 10 km of mother's residential geocode.

From: Ambient air pollution exposure and full-term birth weight in California

pollutant unit N mean SD interquartile range
CO ppm 2,853,245 0.87 0.45 0.56 - 1.09
NO2 pphm 2,808,662 2.42 0.95 1.69 - 3.12
O3 pphm 3,303,834 2.35 0.65 1.89 - 2.74
SO2 ppb 1,167,449 2.10 1.08 1.25 - 2.84
PM10 μ g/m3 1,778,579 31.4 11.2 22.6 - 38.7
PM2.5 μ g/m3 1,402,622 16.7 5.5 12.0 - 21.0
PMcoarse μ g/m3 740,885 15.7 7.5 11.0 - 18.1