Completeness depends on the availability of activity data on each chemical to be covered. Section 7.3.1 (and Table 7.1) provides an assessment of HFCs and PFCs currently used, but inventory compilers should check the situation with in-country sources to confirm those chemical relevant to the local situation. Inventory compilers in countries without domestic aerosol production may need to use expert judgement in estimating activity data, because import statistics are likely to be incomplete (see Volume 1, Chapters 2 and 3), particularly with reference to the propellants and solvents contained. Globally or regionally validated activity databases may be particularly helpful in such instances, where these exist.

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