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NAB Aeroallergen Network outdoor mold spore concentration classifications.
| Concentration (spores/m3)a | NAB classification |
|---|---|
| 0 | Absent |
| 1–6,499 | Low |
| 6,500–12,999 | Moderate |
| 13,000–49,999 | High |
| > 50,000 | Very high |
Data from NAB (2006a).
Daily mean spore concentrations per cubic meter.
