I always try and be diligent with my research and review reading, etc. But this one got me. These generic air filters are the same across many brands on Amazon. Luckily, I am not out too much money, but this is a buyer beware.
Nordic Pure and AIRx air filters on Amazon are the exact same. Different ratings and different pricing. So be careful. This is a case where if you're concerned about what you get (and breathe), you might want to stick to name brands, trusted brands.