The Air in Denver

What was the major problem Denver faced in the late 1900s?

• Traffic congestion

• Air pollution

• Water shortage

• Noise pollution

In which year was Denver removed from the 'worst air' list?

• 1990

• 2002

• 1985

• 2010

What did Denver ban to improve air quality?

• Wood-burning fireplaces

• Gasoline cars

• Coal power plants

• Plastic bags

Fill in the blank: Denver provided free buses for ______ instead of cars.

• Cyclists

• Walkers

• Drivers

• Tourists

Which natural feature is Denver surrounded by?

• Appalachian Mountains

• Rocky Mountains

• Sierra Nevada

• Andes Mountains

Fill in the blank: The federal government said the air was worse than recommended more than ______ days a year.

• 100

• 150

• 200

• 250

What change did area power plants agree to make?

• Use more coal

• Switch to natural gas

• Increase emissions

• Close down

Fill in the blank: Gas stations had to sell special gas that burned ______ during the winter.

• Faster

• Cleaner

• Slower

• Hotter