This article and your project are a real eye-opener for those of us who live in L.A. County. Thank you. However --- your chart is useless here without some explanation of what you are looking at. There is no indication as to what the bars metered from 0 to 30 are supposed to represent. A few clues on that would be very helpful. Without that assistance the chart should be removed as it is nothing but an unnecessary distraction from an otherwise excellent article.