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Table 3 Average concentration of freon 12 and 22 in workshop of refrigeration workers:

From: Cardiotoxicity of Freon among refrigeration services workers: comparative cross-sectional study

Average concentration of freon 12 and 22
in the refrigeration services workshop
The corresponding Threshold
limit value (TLV)mg/m3
Freon 12 5720 mg/m3 ± 580 4950 mg/m3
Freon 22 4310 mg/m3 ± 420 3540 mg/m3