Table 1.

Shortlist of sensor systems by pollutant, type, reference and cost.

Model	Pollutant	Type	Reference	Cost
MoreAir AQ-M	${\mathrm{PM}}_{10}$, ${\mathrm{PM}}_{2.5}$	OPC	-	$95
MoreAir AQ-N	${\mathrm{PM}}_{10}$, ${\mathrm{PM}}_{2.5}$	OPC	-	$95
Speck	${\mathrm{PM}}_{2.5}$	nephelometer	[25]	$150
Pure Morning P3	${\mathrm{PM}}_{2.5}$	OPC	[24]	$170
Dylos DC1100	${\mathrm{PM}}_{\text{2.5–0.5}}$	OPC	[26]	$300
AIRQino	${\mathrm{PM}}_{10}$, ${\mathrm{PM}}_{2.5}$	OPC	[27]	$1000
Met one -831	${\mathrm{PM}}_{10}$	OPC	[28]	$2000
SidePak AM510	${\mathrm{PM}}_{2.5}$	nephelometer	[29]	$3000
AQT-420	${\mathrm{NO}}_2$, ${\mathrm{O}}_3$, ${\mathrm{PM}}_{10}$, ${\mathrm{PM}}_{2.5}$	electrochemical & OPC	[30]	$3700
AQMesh v.4.0	CO, ${\mathrm{NO}}_2$, NO, ${\mathrm{O}}_3$, ${\mathrm{PM}}_1$, ${\mathrm{PM}}_{10}$, ${\mathrm{PM}}_{2.5}$	electrochemical & OPC	[31]	$10,000