If you have any further questions, you may contact OSHA's Office of Health Compliance Assistance at (202) 693-2190. ![]() Gases include the shielding gas, and combustion products. NATURE OF THE HAZARD THE FUME PLUME The heat of the arc or flame creates fumes and gases (fume plume). I hope this answers any questions you have on OSHA's sampling policy for welding fumes. NOTE: This safety and health fact sheet does not address ventilation in confined spaces. Therefore, sampling should be done as normally would be done for any other contaminant (i.e., in the breathing zone outside the ensemble). This area would be an artificially low concentration. Sampling inside the ensemble that you have described would be measuring an unrepresentative atmosphere composed of a mixture of the air passing out of the respirator hood and the air outside the hood. Since we are concerned with what an employee's potential exposure would be, sampling must always be located outside of any respiratory protective equipment. There was no available exposure monitoring in the breathing zone of workers. If the employee is wearing a welding helmet and either no respirator or a negative pressure respirator, sampling should be done inside the helmet. Has OSHA defined the Beryllium lymphocyte proliferation test appropriately. the concentration of airborne particulates in the breathing zone of the worker. ![]() It should be as close as possible to the nose and mouth of the employee, i.e., in a hemisphere forward of the shoulders with a radius of 6 to 9 inches. Definitions of terms used in this Guide are included in Appendix A. The correct placement for air sampling cassettes is near the breathing zone of the employee. OSHA 1910 General Industry > L Fire Protection > 1910.155 Scope, Application and Definitions Applicable to This Subpart > 1910.155(c) Definitions Applicable to This Subpart > 1910. welding fumes, measured as total particulate in the welders breathing zone. Positive-pressure breathing apparatus means self-contained breathing apparatus in which the pressure in the breathing zone is positive in relation. ![]() It is personal safety equipment that includes ear plugs, hard hats, safety goggles, respirators, gloves, and safety shoes. Personal Protective Equipment (PPE) Unlike Personal Monitoring, PPE is a device that provides protection to a worker. In your letter you have asked for a formal response regarding the correct placement of an air sampling cassette on employees performing welding operations while wearing a supplied air breathing ensemble. OSHA formerly had no limit for exposure to welding fumes, which are defined. Hazardous chemicals are monitored at the breathing zone while noise is examined at the ears. This is in response to your letter dated November 3, 1998, addressed to the Occupational Safety and Health Administration's (OSHA's) Directorate of Compliance Programs (DCP), regarding the proper air sampling methodology for welding operations.
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