| CWNMF | Constrained and weighted NMF |
| KKT | Karush–Kuhn Tucker |
| EC | Elementary carbon |
| MER | Mixing-error ratio |
| MM | Majorization-minimization |
| NMF | Non-negative matrix factorization |
| OC | Organic carbon |
| PM | Particulate matter |
| RNMF | Robust NMF |
| SIR | Signal-to-interference ratio |
| SNR | Signal-to-noise ratio |
| WNMF | Weighted NMF |
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