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... workers from disabling respiratory diseases, employers are required to limit the amount of respirable cotton dust in the air. The limits- known as permissible exposure limits-are average exposures as measured over an eight-hour workday. For yarn manufacturing the limit is 200 micrograms of cotton dust per cubic meter of air; for textile waste houses, 500 micrograms; for slashing and weaving operations, 750 micrograms; and for waste recycling and garnetting, 1,000 micrograms. Cottonseed processing operations are covered by the standard, but there is no permissible exposure limit. DUST MEASUREMENT Employers must measure the workplace cotton dust level at least every six months, or whenever there are any changes in equipment or work practices which might increase the amount of cotton dust in the air. Measurements must be representative of an eight-hour period and be ... 000 individuals are disabled from byssinosis as a result of exposure to cotton dust. WORKER PROTECTION To protect workers from disabling respiratory diseases, employers are required to limit the amount of respirable cotton dust in the air. The limits- known as permissible exposure limits-are average exposures as measured over an eight-hour workday. For yarn manufacturing the limit is 200 micrograms of cotton dust per cubic meter of air; for textile waste houses, 500 micrograms; for slashing and weaving operations, 750 micrograms; and for waste recycling and garnetting, 1,000 micrograms. Cottonseed processing operations are covered by the standard, but there is no permissible exposure limit. DUST MEASUREMENT Employers must measure the workplace cotton dust level at least every six months, or whenever there are any changes in equipment or work practices which might increase ...