Table 2.

Modalities and classes for the inhalation exposure parameters.

Parameters	Description		Class
Physical state	Solids	Pellets, chips, and solids with little brittleness	Low
		Powder or grains (e.g., crystallized sugar)	Medium
		Fine powder, airborne dust generation during handling (e.g., powdered sugar, flour, and plaster)	High
	Liquids	Vapor pressure lower than 500 Pa	Low
		Vapor pressure between 500 and 10,000 Pa	Medium
		Vapor pressure above 10,000 Pa	High
	Gas	Usually in a pressurized bottle	High
Process	Enclosed	Any process that is completely contained	Very low
	Enclosed but regularly opened	Any process that is confined but can be opened during the filling, emptying, or control phases	Low
	Open	Any process where the material is localized without specific dispersion and without specific containment	Medium
	Dispersive	Any process, which by the energy deployed or the absence of containment generates emissions into the working atmosphere	High
Collective protective equipment	Indoors	Fume cupboard	Very low
		Other local exhaust ventilation (extractor hood, extraction slit, and extraction table)	Low
		General ventilation	Medium
		No extraction device	High
	Outdoors (natural ventilation)		Medium
Daily amount	< 10 g		Very low
	[10–100 g]		Low
	[100–1 kg]		Medium
	[1–10 kg]		High
	≥ 10 kg		Very high
Duration	< 15 min		Very low
	[15 min–1 h]		Low
	[1–4 h]		Medium
	≥ 4 h		High

The modalities are ranked in relative terms, with regard to each parameter, and ranked from “very low” to “high”.