Air Gradient. I bought their DIY kit.

Cheers, Henry.

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Honestly it was easier than I expected. I have a fairly new home and it has an HRV. I replaced it’s paper filters with MERV 8. I also picked up an Air Gradient, slick little project.

I change my filters about everything 3 months, they get pretty gnarly. I filter the air on the way out with a basic screen because it passes over the blower and…by design it would get absolutely filthy in short order.

I made a bunch of “sensors” in HA to calculate the indoor AQI, and average.

Cheers.

My Air Quality monitoring. I monitoring CO2, VOCs, PM and such. I then have automations run the air exchanger. They say air inside is 5X more polluted then outside I have the opposite.