AQI 42 · Ozone · Trend: Improving
| Average AQI | 42 |
| Good Days / Year | 245 |
| Unhealthy Days / Year | 5 |
| Primary Pollutant | Ozone |
| PM2.5 Average | 7.2 µg/m³ |
| Trend | ↓ Improving |
| Monitoring Stations | 18 |
| Nonattainment Areas | 1 |
Connecticut benefits from strict New England environmental regulations and coastal air circulation. The main air quality concern is ozone transported from the NYC metropolitan area during summer heat waves.
CT DEEP (Dept. of Energy and Environmental Protection) enforces air quality. Member of RGGI (Regional Greenhouse Gas Initiative). Adopts California vehicle emission standards.
Greater Connecticut — marginal ozone nonattainment, primarily from regional transport of NYC metro area pollution.