Air Quality in Yosemite Valley reported as good

The Rim fire west of Yosemite has created smoke and particulates blowing mostly in a northeast pattern from the fire. This data is compiled and presented as an Air Quality Index (AQI). (click to enlarge)

Yosemite Valley air quality remains at GOOD.

Yosemite Valley air quality remains at GOOD.

This graphic below shows the smoke pattern for the entire western California/Nevada area. It can be seen that the trend towards Reno is hitting them with continued smoke. The remote northeast/west area of Yosemite is unhealthy, but the main valley has been spared. Occasional wind changes have brought smoke into the valley, but generally it’s been clear.

 Dispersion of smoke showing air quality

Dispersion of smoke showing air quality

Now look at this computer projection based on atmospheric conditions.

Projection of Air Quality around Yosemite

Projection of Air Quality around Yosemite

For the next couple of days, the trend continues a flow of unhealthy air towards the Reno area. Tuolumne Meadows and Yosemite Valley can be seen as clear. By weekend, the winds are expected to shift to blowing from the northwest which could bring particulates into the valley. Air quality is expected to remain in the good-to-moderate range.

As you can see Yosemite valley is in the green to moderate. Basically, if you have asthma, are very old, or have lung issues, consult your doctor. But if you are young, healthy and need to hike Half Dome before the cables come down Oct 14 – I’d say “The mountains are calling and YOU must go!” !  See you up there next week.

Carpe Diem!


Unrelated thought worth quoting: “The mountains are calling and I must go” – John Muir 

MrHalfDome™ – Rick Deutsch –

One Best Hike: Yosemite’s Half Dome

About Mr Half Dome - Rick Deutsch

Mr Half Dome. Has written the only half dome hiking guide, One Best Hike: Yosemite's Half Dome. Has hiked it 31 times to day. Lives in San Jose, CA Available for presentations. Carpe Diem Experience, LLC
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