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IN AIR RANGE FROM 6-16% AND TCE EXPLOSIVE LIMITS IN AIR RANGE FROM <br /> 8-10. 5% . PCE IS NONCOMBUSTIBLE. <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 TETRAETHYL 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 /> TETRACHLOROETHYLENE (C12C=CC12 ) , 1, 2,-DICHLOROETHYLENE (C1CH=CHC1) <br /> AND TRICHLOROETHYLENE (C1CH=CC12 ) , ARE TOXINS AND CARCINOGENS . <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; a..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 0 . 1ppm (8hrs) 1ppm ( 15min) CARCINOGEN <br /> TOLUENE 100ppm ( 10hrs) 200ppm ( 10min) 2000ppm <br /> XYLENE 100ppm (8hrs) 200ppm ( 10m1n) 1000ppm <br /> ETHYL BENZENE 100ppm (8hrs) N.A. 2000ppm <br /> TETRAETHYL LEAD 0 . 0067PPM N.A. 3 . 6ppm <br /> TETRACHLOROETHYLENE 25ppm (8hr) N.A. 500 PPM/CARCINOGE <br /> 1 <br /> 1,2, -DICHLOROETHYLENE 200 ppm ( 8hrs) N.A. 4000 ppm <br /> TRICHLOROETHYLENE 25 ppm short term N.A. CARCINOGEN <br />