|
| Technology | Limit of detection | Typical range | Reference/Note |
| Chemiluminescence | NO2 detector based on reaction between Luminol and NO2 in air | 10 ppt | 65ppt - 18 ppb | Fast response ~1 s [14] |
| Poly-gel Immobilized Luminol NO2 sensor | 460 ppt | 0.5 - 20 ppb | The gel substrate needs to be replaced every day [15] . | |
| US EPA standard NO2 test method | ~1 ppb | 1 - 500 ppb | LOD and range will vary slightly on different conditions [10] . | |
| Non- Chemiluminescence | Cavity Attenuated Phase Shift (CAPS) NO2 detector | 0.3 ppb | 0.5 - 200 ppb | Very fast response, suitable for online monitoring [17] [18] |
| CAPS NO2 detector, second generation | 0.06 ppb | 0 - 320 ppb | Improved accuracy and sensitivity [19] | |
| Miniature fiber-optic spectroscopy | ~10 ppb | 15 - 50 ppb | Semi quantitative with a relatively large error (±20%) [20] | |
| DPPD-polymer NO2 detector | 0.12 ppm | 0.1 - 25 ppm | Small scale integrated sensor [21] |