Phoenix

Environment

Phoenix has experienced some of the problems associated with urban growth, including air pollution. In 1995 Phoenix was among the cities failing to meet national ambient air quality standards for carbon monoxide and ozone for at least a few days of the year.

The city of Phoenix collects 514,382 metric tons (567,000 tons) of solid waste annually and handles 395,887 metric tons (436,383 tons) as part of recycling programs in which 100,000 households participate. The city operates five water treatment plants, treating 270 billion liters (71.3 billion gallons) of wastewater annually.