The main industrial source of emission of hydrogen sulphide air
pollutant is
(A) Petroleum refineries
(B) Coal based thermal power plants
(C) Pulp and paper plant
(D) Metallurgical roasting & smelting plant
pollutant is
(A) Petroleum refineries
(B) Coal based thermal power plants
(C) Pulp and paper plant
(D) Metallurgical roasting & smelting plant