Environmental Engineering in CE
White smoke coming out of the chimney of a furnace indicates the use of

Low excess air
Gaseous fuel in the furnace
Liquid fuel in the furnace
Very high excess 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

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

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