How dirty is our air?

This photo of a North American city sums up much of what we deal with everyday. Our air, though some of the best in the world, is not always clean. In fact many cities are cautioned on an ever changing basis to watch their exposure to their air.

http://www.enviroflash.info/

In fact there are many State, National and International bodies who watch the ever changing environment and find the indicators of quality variation that define Air Quality and help us to understand why we must reduce pollution throughout the world for the sake of ensuring a sustainable planet for ourselves and for future generations to come.