Changes in your neighborhood.
That is some serious size.
ChangeS? for sure.
BART is finally getting built out to the South Bay to San Jose. .. and massive construction projects abound..
I got more crud floating around in the air from all the construction going down no more than a couple miles away, they should have a pool cleaning comp system.. or it could be the damned squirrels washing their nuts in my pool at night.. i never seen so much curd .. or I may need a new filter. :-}