Phoenix-Mesa-Scottsdale, AZ
- High ozone days per year: 47
- No. of days with unhealthy particle pollution: 9
- People with asthma: 448,872
- Population: 4,737,270
The Phoenix metro area is known for its sprawling car-centric layout, so it’s no surprise that automobiles produce 42% of the air pollution in the surrounding Maricopa County.
Despite the fact that other sources of pollution have dropped dramatically since the 1990s, energy legislation in the state continues to focus on regulating utilities companies rather than focusing on transportation.
