| O3 | ozone |
| PM2.5 | fine particulate matter with diameter less than 2.5 μm |
| FEV1 | forced expiratory volume in 1 s |
| FVC | forced vital capacity |
| SGRQ | St. George’s Respiratory Questionnaire |
| LCQ | Leicester Cough Questionnaire |
| KSQ | King’s Sarcoidosis Questionnaire |
| IQR | interquartile range |
| APES | acute pulmonary exacerbations of sarcoidosis |
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