where EC is exposure concentration,mg m-3; CA is contaminant concentration
in air, mg m-3; ET is exposure time, 8 h/day; EF is exposure
frequency, 250 days year-1; ED is exposure duration, 25 years;
AT is averaging time, 9125 days; C is HgT content in fly ash, mg kg-1;
VF is volatilization factor for elementary Hg, 32675.6 m3 kg-1; PEF is
particle emission factor, 1.36 _ 109 m3 kg-1; HQinh is hazard
quotient, unitless; RfC is chronic inhalation reference concentration,