All laundry and dry cleaning workers in 1970 census | 15559 persons | |
Self-employed laundry and dry cleaning workers in 1970 census | 2586 persons* | |
Persons working in dry cleaning shops in 1970 (15559×21%†) | | 3267 persons |
Dry cleaners in 1970 (15559×17%‡) | | 2645 persons |
Dry cleaning shops in Denmark in 1970 | | 932 shops§ |
Average annual consumption of tetrachloroethylene in Denmark 1968–72¶ | 3885 tons | |
Self-employed laundry and dry cleaning workers in the biography book** | 1012 persons | |
Dry cleaning shops in the biography book with data on number of dry cleaning machines | 268 persons | |
Number of machines listed in the biography book in the 268 shops with data on machines | 539 machines | |
Average number of machines in dry cleaning shops (539/268) | | 2 machines |
Dry cleaning machines in Denmark 1971 (932×2) | | 1865 machines |
Tetrachloroethylene operated dry cleaning machines in Denmark 1971 (1865×85%)†† | | 1585 machines |
Amount dry cleaned textiles in 1968 (4855300 persons×4 kg)‡‡ | | 19421 tons |
Daily capacity of a dry cleaning shop ((19421 tons/932 dry cleaning shops)/260 working days) | | 80 kg |
Tetrachloroethylene used as dry cleaning solvent in Denmark (3885×0.93)§§ | | 3613 tons |
Consumption of tetrachloroethylene per machine in 1970 (3613/1585) | | 2.3 tons |
Consumption of tetrachloroethylene in dry cleaning shops (2.3×2) | | 4.6 tons |
Loss of solvent per hour from correctly dried textiles ((0.5%×80 kg)/8 working hours)¶¶ | | 50 g |
Exposure in the shop ((80 kg×0.5%)/(100 m3×5 air exchange/hour×8 working hours))*** | | 100 mg/m3 |