fog is just a hitch layer of cloud, mist is like fog, but it has moisture in its clouds, and haze is like fog also, but it's a lighter fog and easier to see through

If a place is foggy you can barely see due to fog, that is a THICK cloud (usually near the ground) If a place is misty it means it is full of mist, that is a cloud of very small water droplets (it is LESS dense than fog) And hazy, as its name says, means full of haze, which is similar to mist (a cloud which is not dense) Besides, it may not be hot.

Thank you, but it wasn't clear what the difference is between fog and mist. By the way, I found it on this site http://www.diffen.com/difference.The only difference between mist and fog is density and its effect on visibility. Maybe, this site will be aso helpful for other learners.

Foggy and misty describe weather conditions. Hazy can describe weather conditions, but it can also be used to describe smog or smoke.