Smog is when the air around us gets dirty and yucky. It can happen when we use too many things that burn, like cars, factories, and even people burning things at home or in their yard.
When all this stuff burns, it puts out tiny pieces called pollution or chemicals that can hurt our bodies and the environment. These tiny pieces can mix together and make a big, brown or gray cloud that we can see hanging in the air. That cloud is called smog.
Smog can make it hard to breathe and can even make us sick. So, it's really important that we try to reduce the amount of things we burn and look for ways to make cleaner air so we can all breathe easier and stay healthy.