Environmental Engineering in CE
The main industrial source of emission of hydrogen sulphide air pollutant is

Petroleum refineries
Pulp and paper plant
Metallurgical roasting & smelting plant
Coal based thermal power plants

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Environmental Engineering in CE
Smoke is produced due to

Insufficient supply of combustion air and insufficient time for combustion
Poor design & overloading of furnace
All of these
Poor quality of fuel and improper mixing of fuel & combustion air

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Environmental Engineering in CE
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes

All of these
Poor visibility due to sky darkening
Respiratory trouble
Irritation in eyes

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