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Table 2 Pollutant distributions for entire pregnancy averages.

From: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles county, California

  Pollutanta n Mean IQRb SDc
  NO 112915 27.3 7.5 7.5
LUR_U d NO2 112915 25.2 4.2 3.6
  NOx 112915 52.8 11.6 10.5
  NO 86505 29.4 14.5 11.1
LUR_S e NO2 86505 26.7 5.6 4.4
  NOx 86505 56.7 19.8 14.9
  Naphthalene 15006 181.7 52.2 34.6
  Benzo(a)pyrene 15006 0.13 0.06 0.05
  Benzo(g, h, i)perylene 15006 0.32 0.14 0.08
  Total PAHs 15006 221.4 59.3 38.6
  Benzene 61105 0.66 0.20 0.16
  TSP V 64224 10.5 5.1 5.6
  PM2.5 V 64095 7.5 3.5 4.1
  PM10 OC 64084 5.5 0.99 0.72
Air toxics PM10 EC 64084 2.2 0.55 0.37
  PM25 OC 64055 7.4 1.3 0.95
  PM25 EC 64055 1.9 0.55 0.38
  Ammonium nitrate PM2.5 69936 6.2 1.8 1.1
  Ammonium sulfate PM2.5 69936 5.3 1.8 1.2
  Biomass burning PM2.5 69677 0.27 0.15 0.11
  Diesel PM2.5 69782 3.1 0.99 0.70
  Gasoline PM2.5 44691 1.3 0.71 0.44
  Geological PM2.5 66380 1.2 0.64 0.44
  Meat cooking PM2.5 55570 1.7 0.69 0.50
  Residual Oil PM2.5 69936 0.54 0.23 0.27
  Sea Salt PM2.5 69936 1.5 0.45 0.31
  CO 87815 0.84 0.38 0.27
  NO 87424 41.1 19.8 13.7
  NO2 87424 29.3 4.3 3.2
Criteria NOx 87424 70.3 22.8 15.7
pollutants O3 87815 34.5 8.2 5.8
  PM10 55687 31.4 5.8 3.7
  PM2.5 92865 18.0 2.6 2.1
  1. a Pollutant values are expressed in the following units: NO, NO2, NOx, O3, Benzene, ppb; B(a)P, PAHs, TSP V, PM2.5 V, ng/m3; PM10, PM2.5, PM10 OC, PM10 EC, PM2.5 OC, PM2.5 EC, μg/m3; CMB estimates for source contributions to PM2.5, μg/m3; CO, ppm.
  2. b Interquartile range.
  3. c Standard deviation.
  4. d Unseasonalized LUR model estimates.
  5. e Seasonalized LUR model estimates.