Yosemite National Park posted this time-lapse video showing Yosemite Valley from their Sentinel Dome web cam. It shows the smoke and haze every morning, and then clearing in the afternoons.

I was hiking from Glacier Point on 7/28, and you can see the smoke conditions that day in the video. It was pretty bad in the morning -- could barely see Half Dome, but then it cleared up in the afternoon.

Here's their text with the video:
Quote:
Curious about smoke impacts from the Aspen Fire, currently burning to our south in Sierra National Forest? This timelapse from Glacier Point shows a relatively smoke-free day as well as some subsequent days with morning smoke. This pattern of hazy mornings and clearer afternoons and evenings is expected to continue for the next few days. Fortunately, most of Yosemite has been sheltered from the brunt of the smoke, which is more significantly affecting areas to our south. Fire updates are posted at http://www.inciweb.org/incident/3552/.




Here's the Facebook link. It should work even for non-members: Glacier Point Timelapse