Table 2 RMSE and NRMSE of TGS and MQ4 sensors at high and low methane concentrations

From: Assessment of the applicability of a low-cost sensor–based methane monitoring system for continuous multi-channel sampling

	TGS		MQ-4
[CH₄] %	RMSE	NRMSE	RMSE	NRMSE
3	0.2231	0.0788	-	-
4	0.2795	0.0696	-	-
6	0.6380	0.1198	-	-
7	0.4973	0.0719	-	-
0.096	0.0062	0.0641	0.0302	0.3143
0.145	0.0254	0.1749	0.0836	0.5766
0.193	0.0030	0.0157	0.1216	0.6301
0.240	0.0389	0.1613	0.1653	0.6859

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