Recently we received an email asking, "What's the difference between fog and haze?"
Fog is just a cloud, only it forms close to the surface when air reaches its dew point. Dew, or water droplets, condense on cool grass blades, windshields and rooftops. If the air is really still, water droplets will condense in the air on airborne dust or pollen, to form fog.
You hear weathercaster's say that the fog will "burn off." It really just evaporates as temperatures rise and the air is no longer saturated.
Haze is a reduction in visibility due to air that has a lot of smoke and dust in the air. Like fog, haze tends to become visible in calm conditions when winds are light. It's usually present when there's high humidity and the air is stagnant, not mixing with the air aloft.
