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. 2016 Feb 5;16(2):211. doi: 10.3390/s16020211

Table 1.

Specifications of NO2 and CO sensors, ES-642 and portable ozone monitor (POM).

Pollutant Sensor Sensitivity Response Time Measurement Range Zero Drift
NO2 NO2-B4 −250 to
−600 nA/ppm at 2 ppm NO2 		<25 s from zero to
10 ppm NO2 		0–20 ppm 0–20 ppb change/year in lab air
CO CO-B4 420 to
650 nA/ppm at 2 ppm CO		 <15 s from zero to
10 ppm CO		 0–1000 ppm <100 ppb change/year in lab air
PM2.5 ES642-PM2.5 0.001 mg/m3 NA 0–100 mg/m3 Automatic zero every hour
O3 POM 2 ppb 20 s for 100% of step change 2 ppb–10 ppm <2 ppb/day