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i <br /> f <br /> I <br /> A LESSER KNOWN HEALTH HAZARD RESULTING FROM EXPOSURE TO GASOLINE <br /> IS TOXICITY. SEVERAL COMMON CONSTITUENTS OF GASOLINE HAVE BEEN <br /> LINKED TO VARIOUS HEALTH PROBLEMS . THE CONSTITUENTS OF GASOLINE <br /> THAT HAVE BEEN SHOWN TO CAUSE SERIOUS HEALTH PROBLEMS RESULTING <br /> FROM RELATIVELY MINOR EXPOSURES INCLUDE BENZENE, TOLUENE, meta. <br /> para, and ortho XYLENES, ETHYL BENZENE, AND TETR ETHYL LEAD. <br /> TYPICAL PERCENTAGES (BY WEIGHT) OF THESE CONSTITUENTS IN GASOLINE <br /> ARE: BENZENE - 0 .12-3 .50%, TOLUENE - 2 .73-21 . 80%, meta XYLENE - <br /> 1 . 77-3 . 87%, para XYLENE - 0 . 77-1 .58%, ortho XYLENE - 0 . 68-2. 6860 , <br /> AND ETHYL BENZENE - 0 . 36-2. 86% . TYPICAL PERCENTAGE OF TETRAETHYL <br /> LEAD IS NOT AVAILABLE. <br /> UNITS USED TO DESCRIBE OCCUPATIONAL EXPOSURES TO HAZARDOUS <br /> SUBSTANCES INCLUDE: EXPOSURE LIMIT, ALSO KNOWN AS THE "THRESHOLD <br /> LIMIT VALUE" (TLV) , CEILING LIMIT, AND THE CONCENTRATION LEVEL <br /> THAT IS "IMMEDIATELY DANGEROUS TO LIFE AND HEALTH" ( IDLH) . THE <br /> EXPOSURE LIMIT DEFINES THE MAXIMUM CONCENTRATION OF A SUBSTANCE TO <br /> WHICH ONE CAN BE EXPOSED DURING AN 8 HOUR PERIOD WITHOUT SUFFERING <br /> SIGNIFICANT HEALTH EFFECTS. THE CEILING LIMIT IS THE <br /> CONCENTRATION LEVEL THAT CANNOT BE EXCEEDED AT ANY TIME; i.e . , A <br /> SUITABLE RESPIRATOR MUST BE WORN IF CONCENTRATION VALUES REACH THE <br /> CEILING LIMIT. THE IDHL LEVEL REPRESENTS A MAXIMUM CONCENTRATION <br /> FROM WHICH ONE COULD ESCAPE WITHIN 30 MINUTES OF RESPIRATOR <br /> FAILURE WITHOUT EXPERIENCING ESCAPE-IMPAIRMENT OR IRREVERSIBLE <br /> HEALTH DAMAGE. IDLH VALUES ARE NOT LISTED FOR SUBSTANCES THAT ARE <br /> . POTENTIAL HUMAN CARCINOGENS . <br /> EXPOSURE TABLE <br /> ! SUBSTANCE EXPOSURE LIMIT CEILING LIMIT IDLH <br /> I <br /> BENZENE 0 .1ppm (8hrs ) Ippm ( 15min) CARCINOGEN <br /> TOLUENE 100ppm (10hrs) 200ppm (10min) 2000ppm <br /> XYLENE 100ppm (8hrs) 200ppm (10min) 1000ppm <br /> I <br /> ETHYL BENZENE 100ppm ( 8hrs ) N.A. 2000ppm <br /> TETRAETHYL LEAD 0.0067PPM N.A. 3 .6ppm <br /> PROLONGED EXPOSURES TO CONCENTRATIONS ABOVE THE LIMITS NOTED MAY <br /> AFFECT THE CENTRAL NERVOUS SYSTEM, CARDIOVASCULAR SYSTEM, <br /> RESPIRATORY SYSTEM, EYES , SKIN, KIDNEYS , BONES AND BONE MARROW. <br /> RESEARCH HAS SHOWN THAT BENZENE IS A KNOWN CARCINOGEN. <br /> i <br /> i <br />