Table 4.

Volatility classes of VOCs [113,147].

Description	Abbrev.	Saturation Concentration Range (μg m−3) at 298 K	State in the Atmosphere
Extremely-low volatility	ELVOCs	<3.2 × 10−4	Particle
Low volatility	LVOCs	3.2 × 10−4–3.2 × 10−1	Mainly particle
Semi-volatile	SVOCs	3.2 × 10−1–3.2 × 102	PM and/or vapour phase
Intermediate volatility	IVOCs	3.2 × 102–3.2 × 106	Vapour phase, readily oxidised to SVOCs
Volatile †	-	>3.2 × 106	Vapour phase

^†VOCs and NMVOCs are not listed here since they are superset, e.g., typically IVOCs and some SVOCs.