| APCs | Antigen Presenting Cells |
| BED | Biologically Effective Dose |
| BC | Black Carbon |
| CO | Carbon Monoxide |
| COPD | Chronic Obstructive Pulmonary Disease |
| EC | Elemental Carbon |
| FEF25–75 | Forced Mid-Expiratory Flow |
| FEV1 | Forced Expiratory Volume in One Second |
| FVC | Forced Vital Capacity |
| GM-CSF | Granulocyte-Macrophage Colony-Stimulating Factor |
| ICAM-1 | Intercellular Adhesion Molecule-1 |
| IL | Interleukin |
| IQR | Interquartile Range |
| IUGR | Intrauterine Growth Restriction |
| MMEF | Maximum Mid-Expiratory Flow |
| NO, NO2 | Nitrogen Oxides |
| O3 | Ozone |
| OR | Odds Ratio |
| PAHs | Polycyclic Aromatic Hydrocarbons |
| PM | Particulate Matter |
| PM0.1 | Particulate Matter with an aerodynamic diameter of 0.1 μm |
| PM2.5 | Particulate matter with an aerodynamic diameter of 2.5 µm |
| PM10 | Particulate matter with an aerodynamic diameter of 10 µm |
| ROS | Reactive Oxygen Species |
| RR | Risk Ratio |
| RSV | Respiratory Syncytial Virus |
| SO, SO2 | Sulphur Oxides |
| TLRs | Toll-Like Receptors |
| TRAP | Traffic-Related Air Pollution |
| TNFα | Tumor Necrosis Factor Alfa |
| UFPs | Ultra Fine Particles |
| VOCs | Volatile Organic Compounds |
| WHO | World Health Organization |
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