Table 2.
Precision of low-cost sensors raw output (raw) and calculated mass concentration based on the regression model (mass) expressed as the mean coefficient of variation (CV, %) by aerosol type.
| Aerosol | DC1700 | Sharp DN | Sharp GP | |||||
|---|---|---|---|---|---|---|---|---|
|
|
||||||||
| Small Bin | Large Bin | |||||||
| number concentration | mass | raw | mass | Voltage | mass | Voltage | mass | |
| 0.9% Salt Aerosol | 2.2 | 1.4 | 7.2 | - | 27 | 5.9 | 14 | 5.9 |
| 5% Salt Aerosol | 2.2 | 1.4 | 15 | - | 24 | 5.4 | 51 | 4.8 |
| Arizona Road Dust | 4.3 | 3.1 | 5.0 | - | 27 | 1.7 | 5.0 | 1.9 |
| Diesel Fume | 14 | 1.8 | 12 | - | 17 | 0.8 | 15 | 0.9 |
| Welding Fume | 9.0 | 8.0 | 14 | - | 30 | 7.1 | 2.0 | 1.7 |
| Overall Mean | 7.4 | 3.1 | 11 | - | 25 | 4.2 | 17 | 3.1 |