Ozone (O3)
Measurement Method: UV Absorbance at 254 nm
Instrument: 2B Technologies Model 108-L
Linear Range: 0-100,000 ppb
Precision: 1.5 ppb or 2% of reading for 10-s avg
Accuracy: 1.5 ppb or 2% of reading
Response Time: 4 s for 2-s avg, 20 s for 10-s avg
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Nitrogen Dioxide (NO2)
Measurement Method: Direct Absorbance at 405 nm
Instrument: 2B Tech Model 405 nm NO2/NO/NOx Monitor
Linear Range: 0-10,000 ppb
Precision: 0.5 ppb
Accuracy: 2 ppb or 2% or reading
Response Time 20 s
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Nitric Oxide (NO)
Measurement Method: Oxidation to NO2 with O3
followed by Absorbance of NO2 at 405 nm
Instrument: 2B Tech Model 405 nm NO2/NO/NOx Monitor
Linear Range: 0-2,000 ppb
Precision: 0.5 ppb
Accuracy: 2 ppb or 2% of reading
Response Time: 20 s
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Particulate Matter (PM1, PM2.5)
Measurement Method: Optical Particle Counter,
8 channels, 0.3-2.5 μm
Instrument: Met One Instruments Model 9722
Linear Range: 0-1,000 μg/m3
Precision: 0.1 μg/m3
Accuracy: ≤ 5 μg/m3 + 15% of reading
(better with local calibration vs FEM/FRM)
Response Time: 1 s
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Carbon Dioxide (CO2)
Measurement Method: Non Dispersive Infrared (NDIR) Absorbance
Instrument: PP Systems CO2 Gas Analyzer, Model SBA-5
Linear Range: 0-1,000 ppm
Precision: 1 ppm
Accuracy: 5 ppm
Response Time: 10 s
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Carbon Monoxide (CO)
Measurement Method: Amperometry
Linear Range: 0-50 ppm
Sensor: Alphasense CO-A4
Precision: 0.02 ppm
Accuracy: 0.1 ppm
Response Time: 20 s
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