Quantitative standard/limit value examples Total bacteria: 1,0 10 3 ÷ 7,0 10 3 CFU/m 3 for dwellings and non- occupational indoor environment as well as 7,5 10 2 ÷ 1,0 10 7 CFU/m 3 for occupational environment (in all these indoor spaces no safe level for pathogens (0 CFU/m 3 ) Gram-neg.
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