The ISO 14644-1:2015 – ‘Classification of Air Cleanliness’ is the European standard for cleanroom classification.
The table below shows the class limits for each particle size under the ISO Classification system.
| ISO Classification Number | Maximum concentration limits (particles/m³ of air) for particles equal to and larger than the considered sizes shown below. |
|||||
| ≥ 0.1µm | ≥ 0.2µm | ≥ 0.3µm | ≥ 0.5µm | ≥ 1.0µm | ≥ 5.0µm | |
| ISO Class 1 | 10 | 2 | ||||
| ISO Class 2 | 100 | 24 | 10 | 4 | ||
| ISO Class 3 | 1,000 | 237 | 102 | 35 | 8 | |
| ISO Class 4 | 10,000 | 2,370 | 1,020 | 352 | 83 | |
| ISO Class 5 | 100,000 | 23,700 | 10,200 | 3,520 | 832 | 29 |
| ISO Class 6 | 1,000,000 | 237,000 | 102,000 | 35,200 | 8,320 | 293 |
| ISO Class 7 | 352,000 | 83,200 | 2,930 | |||
| ISO Class 8 | 3520000 | 832,000 | 29,300 | |||
| ISO Class 9 | 35,200,000 | 8,320,000 | 293,000 | |||
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