| Particle size and numerical value CleanlinessLevel of Dustless Workshop | Maximumof dust/M | Maximumof Microbial/M | ||
| ≥0.5m | ≥0.5m | Phytoplankton/M | Sedimentationbacteria | |
| 100 Level | 3,500 | 0 | 5 | |
| 100,0 Level | 35,000 | 200 | 50 | |
| 10,000 Level | 350,000 | 2000 | 100 | |
| 100,000 Level | 3,500,000 | 20000 | 500 | 0 | 
| 300,000 Level | 10,500,000 | 60000 | 5 | |