11/22 Update

After reviewing my population density map and realizing that I actually just made a map showing the populations per county, I began to reevaluate my project.  I have decided that if I were to make the same map using the graduated colors, but based off of the ozone pollution that exceeded standards instead, I would  be able to more effectively be able to determine/show if there is a connection between the number of asthma cases and the amount of ozone pollution.  In order to get the ozone pollution data, I went to the "California Environment Health Tracking" website where I was able to enter the criteria that I was looking for.  My ozone data is based off of the most recent data that they had on the site (2015) which is also the data year that I now plan to use for my asthma data to keep everything consistent.  After downloading the data from the website, I entered it into an excel sheet based off of the county.  Then, I exported the data into GIS where I expressed the xy coordinates and then joined the table with my county data so that I could display it on the map.  Below is my map for the percentage of days that California exceeded the US standard for ozone pollution (0.070 ppm).  I also took Maggie's advice and went for a blue color! My next step will be to download my asthma data and import it into excel.