. Author manuscript; available in PMC: 2021 Oct 1.

Published in final edited form as: Atmos Environ X. 2020 Oct 1;7:10.1016/j.aeaoa.2020.100080. doi: 10.1016/j.aeaoa.2020.100080

Table 1.

Performance specifications for the instruments deployed in the vehicles. All values are obtained from manufacturer’s performance specifications unless otherwise noted.

Pollutant	Manufacturer and Model	Measurement Principle	Resolution	Range	Precision	Response Time	Nominal Flow Rate (mL/min)

O₃	2B Technologies 211	UV absorption	0.1 ppbv	1–2000 ppbv	1% or 0.5 ppbv	4 s	2000
NO₂	Teledyne T500U	Cavity attenuated phase shift	0.010 ppbv	0–1000 ppbv	0.5% (above 5 ppbv)	^a< 8 s	900
NO	Ecophysics CLD64	O3 chemiluminescence	1 ppbv	0–1000 ppbv	2%	<1 s	1000
PN	MetOne GT-526S	Light scattering (laser)		0–105,900 L~¹	10%	1 s	2830
BC	Droplet Measurement Technologies Photoacoustic Extinctometer	Photoacoustic extinctometry	0.2 m–³	<1 Mm⁻¹ – 10000 Mm⁻¹ (60 sec)	10%	<5 s	1000

Manufacturer’s quoted response time is < 30 s. However, analysis of instrument response consistently suggests the response time is < 8 s in our system.