Air quality really isn't terrible. It's much worse in northern California. I live near the origin of the Woolsey fire and it's been good-moderate quality. By next week, it should be consistently good even in the area I live in. Anaheim is far enough away that it won't be a big deal. I was at LAX last week at the peak of the fires and didn't notice any poor air quality.
As a sidenote, getting to Universal Studios from LAX could be a nightmare depending on traffic. If you're thinking of going there for breakfast, you'll spend at least an hour in a car. I wouldn't do it unless you're going to Universal Studios for the day. It costs quite a bit of money to park at Citywalk. You could try to park at the subway station, but there's never any parking there. Just grab Starbucks at LAX. Depending on the terminal, there's several other options as well.