Air quality is greatly affected by cars, factories and trees.
Most areas in the USA and other countries have moderate AQI levels.
This might be an acceptable level but the air we breath should always
be of the top quality. An AQI level between 0-50 is excellent for everyday life.
All of the cities in that range should try and maintain or further improve their AQI.
There are many things that pollute our air that may also cause airborne diseases to form.
Most people don't know that trees are one of the top reasons why the earth is on the verge of destruction.
When trees are cut down at a massive rate it starts to let more greenhouse gasses that start to change
temperatures around the world which can affect air quality dramatically.