Environmental measurements | Unfiltered rides | HEPA-filtered rides | ||||
---|---|---|---|---|---|---|
 | Mean | SD | Median | Mean | SD | Median |
Air inside vehicle cabin | Â | Â | Â | Â | Â | Â |
Particle Number (cm−3) | 41,350 | 12,678 | 40,806 | 44,411 | 16,115 | 40,063 |
PM2.5 (μg/m3) | 11.7 | 6.3 | 10.7 | 12.2 | 6.2 | 10.3 |
BC (μg/m3) | 6.1 | 3.6 | 5.5 | 6.2 | 2.5 | 6.2 |
CO (ppm) | 1.1 | 0.4 | 1.1 | 1.3 | 0.4 | 1.2 |
NO2 (ppb) | 26 | 9 | 26 | 26 | 11 | 24 |
Temp °C | 24.5 | 2.9 | 24.2 | 23.6 | 2.4 | 23.8 |
RH% | 25 | 10 | 28 | 27 | 10 | 28 |
Air inside respirator facepiece | Â | Â | Â | Â | ||
Particle number (cm−3) | 37,999 | 9,545 | 37,928 | 3.5 | 4.1 | 2.2 |
PM2.5 (μg/m3) | 9.1 | 4.8 | 8.2 | 1.4 | 0.6 | 1.3 |