Where did you originally live in CA? We used to live in Fountain Valley when I was a kid. We went state hopping beginning '79 or '80: Kalispell, MT, Tomball, TX (outside Houston), then Tempe, AZ where I graduated high school.
My dad used to work at Flour of Irvine (that space age building off the 405, which I think is now the Con Agra building). He worked there when I was a kid and again during my college years. They ended up in Vista because I met a girl in Utah who was up for a short summer mission trip and she was living in RB and went to Emmanuel Faith. We started dating and spending time down there and the folks really enjoyed the area! Dad then started working for Solar/Catepillar in Kearny Mesa.
The air pollution in UT is fine most of the year. However we get these "inversions" during the winter months. That means that the cold air gets trapped in the valleys by the warmer air on top. The smog piles up and won't budge until a storm rolls in. Pretty miserable!