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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 (Cl2C=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; 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 0. 1ppm ( 8hrs ) 1ppm ( 1-5-min) CAP.CINOGEN <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 /> TETRACHLOROETHYLENE 25ppm ( 8hr) N-A_ 5nn ppm/rnRrrunnr <br /> 1, 2 , -DICHLOROETHYLENE 200 ppm ( 8hrs) N.A. 4000 ppm <br /> TRICHLOROETHYLENE 25 ppm short term N.A. CARCINOGEN <br />