Places like Harrisburg are planting more trees to improve the urban canopy. But if roots of trees buckle a sidewalk, for example, a homeowner is on the hook — which leads some to resist.
By
Adriana Delagarza 
Even moderate amounts of air pollution increase the number of children going to emergency rooms for asthma in Allegheny County, a new study finds.
Even though the new review includes data from 2020, when the COVID-19 pandemic limited travel, there wasn’t a significant improvement in air quality.
The measure in the state Senate would give the legislature more say on who serves on the Air Quality Technical Advisory Committee.
Fewer cars, less coal-powered electricity, and industrial shutdowns combined with a cool and breezy spring has improved air quality in many areas.
By
Susan Phillips 
Pennsylvania areas showed some improvement in the report, but air quality in the Philadelphia and Pittsburgh areas remains poor.
