Possibly higher temperatures and more smog due to increased traffic and industry.

I don’t know in your area. It seems like some years the weather has been manipulated. We had two summers of intense heat & drought which set records 2011-2012. Many wildfires that caused a lot of damages and farmers lost a lot of money too. Then a few years later we had record rainfalls, my city received 27 inches of rain in the month of May plus a lot of rain during other months, it broke records here.