Finally we want to find out if there is any relation between "Ozone" and "Solar Radiation".

As following left chart is a comparison of Ozone and Solar Radiation from May to September. We can see an overall positive trend between the two. But it seems it's a relatively weak relation compared to Ozone and temperature.

The right chart shows a scatter plot of Ozone vs Solar Radiation. The points are colored by month. We can see overall this is a positive relation. If we zoom in to the chart, we can check monthly details.