Table 6.
Summary of PM2.5 sensor performance attributes from the subject matter expert discussion on Day 3.
| Technology Attribute | Minimum Acceptable Value/Range (count)a | Estimated Minimum Acceptable Value/Range |
|---|---|---|
| Accuracy | 10% (2) | Range: 10%–100% |
| 15% (2) 20% (1) 30% (1) 50% (1) 20–50% (1) 20–30% (2) Factor of 2, 100% (1) |
Median: 25% | |
| Bias | 2.5% (1) | Range: 1 μg/m3 – 5 μg/m3 |
| 10% (2) | or 2.5%–50% | |
| 20% (1) 35% (1) 50% (1) 1 μg/m3 (1) 3 μg/m3 (1) 5 μg/m3 (1) |
Median: 2 μg/m3 or 15% | |
| Correlation | r = 0.84 (1) | Range: r = 0.84–0.95 |
| r = 0.87 (1) r = 0.89 (2) r = 0.95 (1) | Median: r = 0.89 | |
| Detection Limit | 1 μg/m3 (1) | Range: 2–4 μg/m3 |
| 2 μg/m3 (1) 4 μg/m3 (1) |
Median: 2 μg/m3 | |
| Precision | 10% (1) | Range: 10%–50% |
| 20% (2) 25% (1) 30% (1) 50% (1) |
Median: 23% | |
a
Numbers (X) represent the count of SEs who suggested each metric.
(Note: The listed sensor performance values should not be considered suggestive about any specific US EPA recommended means of establishing such a value).