Awesome, glad it helps.
There are many pros and cons to all of the different sensors, some are quite cheap and others are quite expensive.
I would recommend you check out the 6 ones on this list
https://www.wxforum.net/index.php?topic=38495.0 The likes of the PurpleAir PA-II (one of those 6) has a big community on WXForum (over half the articles in the "Air Quality Senors" category regard PurpleAir, and so it's easier to get help etc). Plus the ones on the list upload it to a publicly available map and I'm pretty some of them will save online all of your Air Quality data from whenever you install the Sensor so that you can look back at it, at a latter time.
Entirely dependent on what you are after, and up to you, but just thought I'd let you know of those options. Best of luck finding the one right for you, happy hunting.