. Author manuscript; available in PMC: 2020 Aug 3.

Published in final edited form as: J Expo Sci Environ Epidemiol. 2020 Feb 3;30(3):554–566. doi: 10.1038/s41370-020-0203-9

Table 1.

ART exposure determinants used for testing independence with the measurements in RTs.

Modifying factor	RT variables (example)	Variable type
Substance emission potential	Vapor pressure^a	Continuous
	Product concentration^a	Continuous
	Dustiness^b	Categorical
Activity emission potential	Activity (sub)classes (e.g., surface spraying of liquid products)	Categorical
Local control	Category of primary local control (e.g., enclosing LEV)	Categorical
Segregation	Segregation (e.g., partial segregation)	Categorical
Dilution	Room volume Air-exchange per hour	Categorical
Separation	Separation (e.g., partial separation with ventilation)	Categorical
Surface contamination	Surface contamination (e.g., good housekeeping)	Categorical

ART Advanced REACH Tool, LEV local exhaust ventilation, RT regression tree.

For volatile liquids, fugacity was calculated as log(vapor pressure × concentration).

For powders and solids, log-concentration was calculated.