| NTA | Nitrilotriacetic acid |
| AA | Ascorbic acid |
| FEV1 | Forced expiratory volume in 1 s |
| FVC | Forced vital capacity |
| VC | Vital capacity |
| GSSG | Glutathione disulfide (oxidised glutathione) |
| GSH | Reduced glutathione |
| GSx | Total glutathione |
| 4-HNE | 4-hydroxynonenal |
| DHA | Dehydroascorbate |
| EBC | Exhaled breath condensate |
| RTLF | Respiratory tract lining fluid |
| SSc | Systemic sclerosis |
| COPD | Chronic obstructive pulmonary disease |
| Fe | Iron |
| Cu | Copper |
| BAL | Bronchoalveolar lavage |
| DTPA | Diethylenetriaminepentaacetic acid |
| DLCO | The diffusing capacity of the lungs for carbon monoxide |
| Vit. C | Vitamin C |
| ICP-MS | Inductively coupled plasma mass spectrometry |
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