| COPD | Chronic obstructive pulmonary disease |
| COVID-19 | Coronavirus disease 2019 |
| SARS-CoV-2 | Severe acute respiratory syndrome coronavirus-2 |
| PM10 | Fine particulate matter with a diameter of 10 μm or smaller |
| PM2.5 | Fine particulate matter with a diameter of 2.5 μm or smaller |
| NO2 | Nitrogen dioxide |
| NOx | Nitrogen oxides |
| SO2 | Sulfur dioxide |
| 1-OHP | 1-hydroxypirene |
| WHO | World Health Organisation |
| RR | Relative risk |
| OR | Odds ratio |
| CI | Confidence interval |
| IQR | Interquartile range |
| DALYs | Disability-adjusted life-years |
| PAH | Polycyclic aromatic hydrocarbons |
| FEV1 | Forced expiratory volume in one second |
| FVC | Forced vital capacity |
| MV | Minute ventilation |
| Ap | Apnoea |
| IRV | Inspiratory reserve volume |
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