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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, TOIJJENE, meta. <br /> para, and Ortho XYLENES, ETHYL BENZENE, AND AETEIYL 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 .686% , <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 /> BENZENE O.lppm ( 8hrs ) 1ppm ( 15min) CARCINOGEN <br /> TOLUENE 100ppm (10hrs) 200ppm (10min) 2000ppm <br /> XYLENE 100ppm ( 8hrs ) 200ppm (10min) 1000ppm <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 /> IMMEDIATE SYMPTOMS OF OVER-EXPOSURE INCLUDE: EYE IRRITATION, NOSE <br /> AND THROAT IRRITATION, HEADACHE, NAUSEA, DIZZINESS , DROWSINESS , <br /> WEAKNESS , CONFUSION, EUPHORIA, EXCITEMENT, STAGGERED GAIT, <br /> ABDOMINAL PAIN, RESPIRATORY DIFFICULTIES , MUSCLE FATIGUE, AND <br /> COMA. <br /> • <br />