Hi Lakshu,
This sounds like a great experiment!
I am sorry to say that the eco badge kit that you mentioned in the post doesn't appear to be readily available any more.
You might want to consider something like this:
https://www.amazon.com/Ozone-Test-Paper ... est+strips
Or
https://www.carolina.com/catalog/detail ... rIQAvD_BwE
This item will give you both the test cards and the Colormetric chart. Please do note that you only need to expose these cards to the ambient air that you are measuring for 10 minutes. You will then compare strip to the chart and this will give you a range of reading. For the one shown in the links, the ranges are <less than 90, 90 to 150, 150 to 210, and greater than 210 micrograms ozone per cubic meter of air. (For Ozone, 1 ppb = 1.97 µg/m3 so you will need to convert these results to Parts Per Billion,ppb)
For this experiment, there are a couple of items that you will want to watch out for:
1. These test strips will only work under certain environmental condition such as % humidity. (Please refer to the directions for these tests strips). You will want to make sure to record these data (temperature, %RH, time of days, etc...) along with your test strip results to be sure that the data is valid.
2. In regards to the locations and the test, you have a very good idea / setup. The only suggestion I have is that you might want to repeat this experiment during different time of the day. For example, morning rush hour, mid-day, evening rush hour, etc...
3. You might also want to add a "control" area for testing so that you have data to show the accuracy of these test strips.
Finally, as a point of comparison, you may want to look at the ozone data from the EPA.
https://www.epa.gov/outdoor-air-quality ... y-monitors
It looks the EPA have 2 monitoring station near St. Louis, one near I-70 (Hyde Park) and one near East St. Louis (I-64). It could be interesting to see how your data compares.
Best of Luck with your experiment!
Willey