If someone in your household has respiratory symptoms that won’t respond to medication, allergies that seem to kick in the second you’re home, or sinus pressure that just never clears, the air is worth looking at. The longer you wait, the longer whatever’s in there keeps putting spores out. That goes for new parents getting a nursery ready, anyone with a compromised immune system, and people managing asthma or COPD who want to know their baseline.
It doesn’t have to be about symptoms either. Maybe you just bought the place, you knocked out a wall during a remodel, or there’s a smell somewhere you can’t pin down. Santa Ana runs warm pretty much year-round, and the marine layer rolling in off the coast keeps things more humid than most people expect from Southern California. A lot of the housing stock here is older — stucco construction, slab foundations, bathrooms and kitchens that have seen a few decades of moisture. Mold doesn’t need much. It shows up in the air before it shows up on a wall, and by the time there’s a visible patch, it’s usually been growing behind something for a while.