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The Pima County Department of Environmental Quality is seeking public input on a request for an air quality permit for the planned Marana Regional Landfill at an open house Tuesday and public hearing Wednesday. Read more»

Students from Fruchthendler Elementary School participated in 'Trekking Thursdays' leading up to Walk n' Roll to School Day in 2006.  Fruchthendler participates in Walk n' Roll every year.

Students around Tucson won't be hiding inside this Friday the 13th when they walk, ride, skate and scooter to school to improve Pima County's air quality in the annual Walk n' Roll to School Day. Read more»

Emissions from cars and power plants burn fossil fuels contribute to the creation of the ground-level ozone.

Rising summer temperatures and increased vehicle emissions can cause the formation of a pollutant called "ground-level zone" that can cause short-term health effects. Read more»

Air appears hazy near the Rincon Mountains in December 2010.

Early risers may have wondered why the sky appears hazy in the mornings now that temperatures are dropping. The effect is called temperature inversion. Read more»