Well... HSE did a survey of premises welding Stainless Steel....it doesn't make for good reading... http://www.hse.gov.uk/research/rrpdf/rr770.pdf

"Approximately 30% of the companies surveyed by telephone use no Local Exhaust Ventilation (LEV) for stainless welding at any time. More than two thirds of these companies did not conduct any form of health surveillance. The organisations surveyed were almost all Small to Medium Enterprises (SMEs), with an average of 6 workers welding stainless in each company, although not all of these would weld stainless exclusively. A total of 10 site visits were made to 8 different companies. These revealed: Breaches of occupational exposure limits were uncommon, even where exposure control strategies were judged to be inadequate. A significant proportion of companies were not controlling stainless welding fume exposures in accordance with COSHH essentials welding guidance. There appears to be a common perception within industry that TIG welding of stainless steel does not require engineering control"