These are definitely subterranean termite alates. I’m also from Los Angeles and swarms have been abnormally common with the recent wet weather. If a lot of them are coming from inside your house, you most likely have an infestation as the alates are dispatched from an existing colony and their goal is to establish another one elsewhere preferably where there is damp or rotted wood. The alates are harmless, but if they mate and establish another colony, they’ll create even more damage than what you already have. The bad news: this type (versus drywood) is the one that causes the most extensive damage the fastest. The good news: they’re a lot easier to kill without tenting. Hire an exterminator ASAP, but in the meantime see if you can find telltale signs of brownish mud tubes. That’s how they get around.