John's Response
I like that you have an overall top-down perspective of many of the big issues that are a factor in the air we breath (good and bad). Much of society still doesn't know that these are a big deal within our daily lives; extending many health problems, mainly into our water. Your thumbnail sketch of the water cycle could provide for some good really interesting and informative illustrations.
One thing to consider is going for a more focused point of view. Looking directly at one issue instead of a handful. I found a few issues from your rough that I thought could be interesting angles to tackle; maybe some angles that others wouldn't look into making into a info-graphic.
1. Mother Nature: Taking more of a positive point of view on how our air is filtered no polluted
2. Natural Disasters: You had down elements like earth, wind, fire. That made me think of looking into how the air can be affected when nature disasters occur (tornadoes, hurricanes, volcanoes, etc.)
Tight comp and Eye direction
