Table 3.
PM2.5 criteria/DQIs defined relative to any instrumentation for regulatory air monitoring requirements in the U.S., EU, and China (Williams et al., 2018; Table B1). Note: A description of the terms and abbreviations are listed in Table S3.
| Performance Attributes/DQIs | Decision Support |
|---|---|
| Accuracy/Uncertainty | RPDflow:
≤2% %Diffspecifiedflow: ± 5%, ± 5% %Diffonepointflow: ± 4% %Diffmultipointflow: ± 2% Tamb (°C): ± 2, ± 2, ± 2 Pamb (mm Hg): ± 10, ≤ 7.5, ± 7.5 RHamb: ± 5% Clock/timer (sec): ± 60, ± 20 D50: 2.5 ± 0.2 μm Collection efficiency: σg = 1.2 ± 0.1 Average flow indication error: ≤ 2% Slope: 1 ± 0.15, 1 ± 0.10 Intercept (μg/m3): 0 ± 10, 0 ± 2 Aerosol transmission efficiency: ≥ 97% Expanded uncertainty: < 25% in 24-hr averages Zero level: < 2.0 μg/m3 Zero check: 0 ± 3 μg/m3 Maintenance interval: < 14 days |
| Bias | None |
| Completeness | Completeness (%): 85, ≥90 |
| Detection Limit | Detection limit (μg/m3):
< 2.0, 2 Tamb resolution: 0.1°C Pamb resolution: 5mm Hg |
| Measurement Duration | Measurement duration: 60min |
| Measurement Frequency | Flow rate measurement intervals: ≤30s |
| Measurement Range | Concentration range: 0–1000 μg/m3, (0–1000 24-hr avg, 0–10000 1-hr avg μg/m3), 3–200μg/m3 |
| Precision | CVconc: ≤5%, ≤
15% CVflow: < 2%,≤ 2%, (Avg: ≤2%, Inst.: ≤5%) σ:≤2μg/m3 Precision: < 2.5 μg/m3 RMS: 15% |
| Response Time | None |
| Selectivity | Temperature influence: zero temperature
dependence under 2.0
μg/m3,
< 5.0% change in min and max temperature
conditions Voltage influence: < 5% change in min and max voltage conditions Humidity influence: < 2.0 μg/m3 in zero air |