Long exposures + cold temps. The steam is from the airports powerplant. This photo is pre-renovation of the Encounter.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/14727154@N03">John Murphy</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/kingair42/2144886849/">Cold Night at LAX</a>