| Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 |
---|

Black Carbon | 1 | 2.0 (1.2–3.6) | 2.4 (1.4–4.1) | 3.6 (2.2–5.9) |

NO_{2} | 1 | 5.7 (2.0–15.9) | 8.7 (3.2–23.5) | 18.5 (7.1–48.7) |

- Data represent the fold-increases in the number of tracts meeting the criteria for EJ designation among the approximate 100 tracts represented in each quartile of increasing BC or NO
_{2} exposure relative to the occurrence of EJ tracts in the lowest exposed quartile. Parentheses represent the 95% confidence interval for the determination