Table 3.

Techniques and its detection for various gases.

Gases	Techniques	Concentration	References
Ammonia	PTR-MS	90 ppt	[129]
	SIFT-MS	10 ppb	[130]
	GC-IMS	4 ppt	[103]
Acetone	PTR-MS	50 ppb	[131]
		1.33 ± 0.19 ppm	[40]
	GC-MS	0.049 ppb	[40]
Nitrogen Monoxide	Chemiluminescence	200 ppb	[75]
Isoprene	PTR-MS	100 ppb	[40]
	SIFT-MS	0–474 ppb	[132]
Methane	SIFT-MS	0.2 ppm	[133]
Ethanol	PTR-MS	289.00 ± 67.47	[40]
	SIFT-MS	0–1663 ppb	[134]