Japan is the only country which has specified an ambient air standard 0.6 pg per cubic meter in the atmosphere for dioxin [4]
.
WHO has specified a standard for Total Daily Intake (TDI) of 1- 4 pg TEQ/kg body weight/day.
Considering average body weight of 60 kg and air intake of 20 m3/day (with 5% inhalation contribution),the allowable concentration levels were calculated to be 0.15 0.60 pg TEQ/m3 in ambient air.