| AIC | Akaike information criterion |
| CI | confidence interval |
| EC | elemental carbon |
| ED | emergency department |
| IL | interleukin |
| IQR | interquartile range |
| OC | organic carbon |
| OR | odds ratio |
| PAH | polycyclic aromatic hydrocarbons |
| PM | particulate matter |
| WBC | white blood cell |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.