<p>
</p>
<p>I myself was very concerned with LA’s rumored smog last year. And while I haven’t been in enough US cities to give an overall assessment, I can honestly say that Pasadena has cleaner, better air than the Bay Area, where I’ve lived most of my life. </p>
<p>There’s virtually no smog until possibly summer. However, classes are ending around then anyways, and with the stifling heat, one wouldn’t want to go outside much anyways. </p>
<p>Basically, if one finds the air quality around Stanford suitable, they won’t have any complaints about Caltech.</p>