The police are out and about over Lincoln Heights today. Before now, I've not caught the sound of a low flying helicopter, but they are a permanent fixture of the LA landscape. According to knock-la.com, in 2012 they each cost $1,056 per hour to operate. More recent data was not available. It's 72º out but the thick, smoggy air makes it feel warmer. The AQI is apparently 72 (moderate), but looking at the nearby mountains in the Angeles National Forest, it seems like it should be worse.