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Table 6 Criteria for determining the availability of chemicals and scoring

From: A screening tool to prioritize public health risk associated with accidental or deliberate release of chemicals into the atmosphere

Availability criteria Availability score
High Production Volume chemical, few purchase restrictions, widely used and transported, minimum security (HPV) 5
Commercially Available, No (or few) purchase restrictions, widely used, minimum security (CAN) 4
Commercially Available, major purchase Restrictions, limited use, tight security (CAR) 3
not commercially available, Chemical Synthesis easy, available precursors, standard equipment (CS) 2
not commercially available, Chemical Synthesis Difficult (complex multistep), special equipment (CSD) 1