(6)
\(HQ=\frac{\text{CDI}}{\text{RfD}}\) (7)
Where,
E - Chronic daily intake, it is expressed in mg per kg/day,
CPW - Concentration of specific pollutant in groundwater in mg per day,
IR-Rate of human ingestion in Litres per day,
ED -Duration of exposure and expressed in years,
EF -Frequency of exposure and expressed in no. of days per years,
ABW - Average body weight in Kilogram.
AET -Average time in days,
HQ -Non-carcinogenic for Hazard Quotient,
RfD - Reference dose of nitrate and expressed in mg/kg/day.