If I wasn't choking with cough last year on that day, I would have grabbed camera gear and shot film from Berkeley hills. The sky was blood orange, changing hue all day long.
The index was like 350np they will stop a football game at 80-120np.
The normal day is 2np in cities maybe 3-4 for LA
Shit truned red because of September's earth position to the sun. Other days it would be greenish orange or purple in winter.
Something to do with nature's sky f'ilters giving in different colors of the prism