When you have the sun and you have the smoke moving through, different wavelengths of light are able to pass through. Red and orange is able to pass through that smoke while shorter wavelengths in the blue color are not. So it leaves us with this red to orange color. Now, check this out. Even though we have all that smoke i showed you, air quality is reading moderate to unhealthy, but the way it looks, youd think it would be reading very unhealthy. Ill explain why it looks very unhealthy but were not breathing in very unhealthy air. Pretty complicated but ill see you back here in about 18 minutes. That does sound complicated. Thank you, jeff. So how are we coping with 22 days of bad air . Live from San Francisco to continue our coverage. Pete, how bad is the air there . Reporter yeah, well, jessica, surprisingly the air quality isnt as bad here in San Francisco as weve seen recently, but as you guys mentioned, were in this long stretch of that 22 days straight of the spare the air aler