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

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

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Environmental Engineering in CE
Smoke is produced due to

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

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