. Author manuscript; available in PMC: 2022 Jan 1.

Published in final edited form as: Atmos Environ (1994). 2021;246:10.1016/j.atmosenv.2020.118099. doi: 10.1016/j.atmosenv.2020.118099

Table 2.

Summary of air sensors use cases and testing considerations by pollutant.

	PM₁₀	NO₂	CO	SO₂
Desired Uses	Fires, plumes, dust storms	Fence line, near roads, mobile monitoring	Combustion, occupational, indoors	Plume identification, plume sniffing
Desired Measurement Range	2–1000 μg/m³	1 to >100 ppbv	0.04 to 3 ppmv (ambient) or up to 300 ppmv (ambient, source, occupational)	1 ppbv (ambient) or up to ppmv (source)
Expected Interferents or Other Causes of Bias	Variation in ratio of fine/coarse particles, RH, sampling loss of coarse particles	T, RH, O₃	T, RH	NO_x, hydrocarbons, T, RH
Field Testing	Variation in RH, nominally variation in ratio of fine to coarse particles over time or through multiple test sites	Ambient and near-source locations	High and low concentration regimes	High variability of concentrations in near-source plumes
Laboratory Testing	Test high PM concentrations, response to variable size distribution, sampling efficiency including effects of orientation and wind	Test for wider variety of interferents and for hysteresis	Test wider concentration range and variety of interferents	Test wider concentration range and for hysteresis
Complementary Measurements	PM_2.5, T, RH	T, RH, O₃, other pollutants	T, RH	T, RH, hydrocarbons