Houston-The Woodlands-Sugar Land, TX
- High ozone days per year: 52
- No. of days with unhealthy particle pollution: 1
- People with asthma: 445,024
- Population: 6,892,427
Houston’s climate and its car-dependent culture, coupled with the area’s petrochemical facilities, shipping channel, and busy interstate, create an ozone problem that blankets the metro area in smog.