| CO | carbon monoxide |
| CTB | cytotrophoblasts |
| HEPA | high efficiency particulate air |
| NO2 | nitrogen dioxide |
| OS | oxidative stress |
| O3 | ozone |
| PM | particulate matter |
| PM2.5 | particulate matter < 2.5 µm |
| PM10 | particulate matter < 10 µm |
| PAH | polycyclic aromatic hydrocarbon |
| PTB | preterm birth |
| ROS | reactive oxygen species |
| STB | syncytiotrophoblasts |
| US | United States (US) |
| WS | wildfire smoke |
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