A darkroom needs to be sealed up with filtered air flow. I have a warm air vent with an extra filter in it which is the only air inlet to the room. Before printing I wipe down all surfaces with a damp cloth. I also have a dedicated little vacuum cleaner with a HEPA filter to use before printing.
It's amazing how much dirt and dust get in there even with the door closed.
Also - NO PETS in the darkroom is the rule. I love my Reilly but he's not allowed in the darkroom.
Finally, I use a anti-static cloth on each negative just before placing in the enlarger. That said, I still have trouble in the winter when the air is dry. I would think Sacramento would have less on that account. Good luck and keep your spotting dyes at hand.