5 Exposure limits in the UKand are used for substances orconcentrations causing acute harmfuleffects. Many substances have both anLTEL and an STEL, the latter being thehigher value.Table 2 gives UK OELs for substanceslikely to be found in welding fume. Eachcomponent of the fume has its ownOELs, but welding fume as a "substance"in its own right also has an OEL. Controlof gases and fume must be such thatexposure does not exceed either the OELfor any component of the fume, nor forthe fume as a whole.SubstanceType of limitLTEL (8-hour TWA) STEL (15-min TWA)(mg/m³)(mg/m³)Welding fumeOES5Iron oxide fume (as Fe)OES510Zinc oxide fumeOES510Manganese fume (as Mn)OES13Chromium III compounds (as Cr)OES0.5Chromium IV compounds (as Cr)OES0.05Nickel (insoluble compounds)OES0.5Copper fumeOES0.2OzoneOES0.2 ppmNitrogen monoxideOES25 ppm35 ppmNitrogen dioxideOES3 ppm5 ppmCarbon monoxideOES50 ppm300 ppmTable 2: UK occupational exposure limits for substances likely to be found in welding fume.15
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