| AQ | Air quality |
| DQO | Data quality objective |
| LCPMS | Low-cost PM (PM1, PM2.5, PM10) sensors |
| MMAD | Mass median aerodynamic diameter |
| MNB | Mean normalized bias |
| MNE | Mean normalized error |
| MLP | Multilayer perceptron |
| OPCs | Optical particle counters |
| PM | Particulate matters |
| RSs | Regulatory stations |
| RH | Relative humidity |
| TSP | Total suspended particles |
| HVAC | Heating ventilation air conditioning |
| IoT | Internet of Things |
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