The air quality was fine earlier this week (except for a spike), but went way south towards the end. Probably from people using their fire places. The most worrisome particular matter is those with a diameter of 2.5 microns.
We had some haze today. But since there were no clouds, the sky brightness didn't drop out. At the same time, the sky never got very bright for a cloudless day. We experienced a thin layer of cirrus clouds only.