| NAI | Negative air ion |
| PM | Particulate matter |
| PEF | Pulsed electric field |
| UV | Ultraviolet |
| SA | Salicylic acid |
| MV | Methyl viologen |
| KV | Kilovoltage |
| RANIs | Releasing amounts of negative ions |
| PVC | Polyvinyl chloride |
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