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t;A* 1'I(U1'IA0,IL:; EFFECT • 1'ItI1: (i6 AY VUI.. 1N AlIl) LOCATION: <br /> WE I(:I1'PE <br /> AVI:ItACE; Ll)WER UPPER <br /> H IIRS. LIMIT LIMIT <br /> Hydrogen Sulfide NTS Rotten egg odor In ImpaIrti senate of • Coal gas, petroleum set. <br /> Specific Gravity small coucentrat.lons. SlUell rapidly as run- gas, sludge gas. Local <br /> or Odor not evidernt at centration increases. Il) ppm 4.3 46.0 near bottom, may be ab( <br /> Vapor Density high concentratiomi Acute poisoning bottom if air is heate4 <br /> (Air-1) 1. 19 colorless, flammable. paralyzes respiratory and highly humid. <br /> winter. <br /> Methane CH Colorless Simple asphyxiation Natural <br /> 4 gee, sludge gay <br /> Specific Gravity Odorless Acts mechanically to swamps, marsh. At top <br /> or Tasteless deprice tissues of 02 -- 5.0 15.0 increasing to certain <br /> Vapor Density Flammable <br /> Air-1 0.55 <br /> Nitrogen N2 Colorless, tasteless, Sewer gas, sludge gas <br /> Specific Gravity non-flammable. Physiologically Near top, but may be <br /> or Principal constituent Inert -- -- -- found near bottom. <br /> Vapor Density of air. <br /> Air-1 0.97 <br /> Oxygen02 Colorless, odorless, Below 19.5% is con- Oxygen depletion from i <br /> (in air) tasteless, supports sidered Immediately ventilation and absorp: <br /> Specific Gravity combustion dangerous to life -- -- -- of chemical consumptio, <br /> or and health. oxygen. <br /> Vapor Density 1. 11 <br /> Sludge Gas May be practically Digestion of sludge ne. <br /> Specific Gravity odorless, colorless, Will not support life -- 5.3 19.3 top of structure. <br /> or flammable <br /> Vapor Density <br /> Variable <br /> Sulfur Dioxide SO2 Nun-flammable dues Industrial process ust <br /> - Specific Gravity not support combustion. Irritates respiratory sulfur compounds, pape <br /> or Colorless, strong tract membranes. 2 ppm -- -- .productsLocated at <br /> Vapor Density penetrating odor. bottom s. structures. <br /> (Air-1) 2.26 <br /> 1 <br />