Bay Area Air Quality is Yellow, Sun Red
The reason the air looks yellow today and the sun (when you can see it) looks red, is because of smoke from northern California Wildfires. The particulates (ash) from the fires are causing the discoloration in the atmosphere, and if you’re like me, the dry itchy eyes.
Today, 8/18, and tomorrow, 8/19, Air Quality Advisory! Bay Area air quality is expected to be Moderate in all regions.
— Bay Area Air Quality (@AirDistrict) August 18, 2021
The yellow color of our skies and red color of the sun is a matter of the sizes of the particles in the air. It’s also a function of the number of particles per unit volume in air, and to a much lesser extent – during wildfire season – the color of soot itself.
San Francisco’s marine layer and north/northeast breeze has been keeping the majority of smoke away, and is expected to continue to keep the harsh air away through the weekend.
The sun begins to set behind the San Francisco skyline as seen from Alameda, Calif., on Wednesday, Aug. 18, 2021. The skies in the Bay Area are full of smoke due to several wildfires raging in Northern California. #wildfires #bayarea #smoke #sanfrancisco pic.twitter.com/m0lMREcUCZ
— Jose Carlos Fajardo (@jcfphotog) August 19, 2021
BUT the air is still moderately bad for the time being. Good news is, it’s meant to be back to green/good by Saturday. Thank you Fogust!
San Francisco weather: apocalyptic snow globe 🌞 pic.twitter.com/pz157E1O92
— Jessica Christian (@jachristian) August 19, 2021
For more info on the wildfires visit: https://www.fire.ca.gov/incidents/