• Fog consists of water droplets and forms in calm, cool mornings, while pollution haze arises from trapped particles and pollutants.
• Fog usually appears white or gray and dissipates as the day warms, whereas pollution haze often has a brownish tint and lingers longer.
• Smell and the clarity of distant objects can help distinguish fog (odorless, gradual fading) from pollution haze (smoky/chemical smell, blurry appearance).