A&B internal sensors

My sensor is no longer on the AirNow map so I reached out to the EPA. This is their reposnse: I have looked at the PurpleAir map for your sensor as shown in the screenshot below. The popup shows that there is a lack of agreement between the A&B internal sensors inside your PurpleAir. One of our quality assurance checks to be on the AirNow Fire and Smoke map is that these internal sensors are in agreement most of the time. I suggest you check with the PurpleAir people on what steps you might take to try and address this problem.

How do I get the A&B sensors to align?

Hi @Hmseiver, in this case, I recommend viewing our Sensor Maintenance article. Try the cleaning method mentioned there.

If that does not help, you may want to look into laser counter replacement. This is mentioned at the bottom of the same article.