Danbury, Connecticut
Environmental Quality Report Card
Danbury reports good air quality, with AQI levels better than the national average. Water tests indicate concerning conditions across key measures. Facility compliance with environmental standards is below the national average.
Air Quality (Annual Overview)
Grade AYearly average AQI (2024): 27.6. National average: 41.4. 40 moderate days, 0 unhealthy days recorded.
Facility Violations
Grade AFacilities like factories and treatment plants had 2 significant and 361 total violations reported in 2024.
Water Quality (No EPA Standard)
These measurements do not have formal EPA standards but are still important indicators of local water quality.
| Characteristic | Local Value | Unit | Last Measured |
|---|---|---|---|
| Escherichia coli | 547.50 | MPN/100mL | 9/16/2024 |
| Depth, Secchi disk depth | 2.80 | m | 10/22/2024 |
| Temperature, water | 22.70 | deg C | 9/17/2024 |
| Dissolved oxygen (DO) | 9.54 | mg/L | 9/16/2024 |
| Temperature, air | 22.67 | deg C | 6/24/2024 |
| Precipitation | 0.00 | cm | 6/24/2024 |
| Wind Speed Severity (choice list) | 1.00 | N/A | 6/24/2024 |
| Total Coliform | 980.39 | MPN/100mL | 9/16/2024 |
| Depth, bottom | 1.42 | m | 6/24/2024 |
| Precipitation event duration | 0.00 | hours | 6/24/2024 |
Air Quality Details (2024–2025)
The Air Quality Index (AQI) measures how clean or polluted the air is. A lower AQI means cleaner air. Main pollutants include particulate matter like PM2.5, ozone, and others regulated by EPA standards.
Air quality data sourced from OpenAQ, aggregating official monitoring stations.
| Yearly Average AQI | National Average AQI | Good Days | Moderate Days | Unhealthy Days | Worst Day AQI | Top Pollutant |
|---|---|---|---|---|---|---|
| 27.6 | 41.4 | 323 | 40 | 0 | 88 (on 12/27/2024) | PM2.5 |
Monthly AQI Trend
Monthly average AQI values over the past year. Lower values are better. Peaks may indicate pollution events.
Facility Compliance
Facility compliance and violation data come from the EPA's ECHO database.
841 monitored facilities
Total Violations: 361
Significant Violations: 2
Total Penalties: $118,021
Despite 2 significant violations, Danbury reported 361 total violations across monitored facilities in 2024. This results in a compliance grade of A, reflecting strong adherence to environmental standards compared to national benchmarks.
About the Data
This report uses the latest publicly available environmental data:
- Air Quality: Data sourced from the OpenAQ Platform, aggregating official air quality monitoring stations near Danbury.
- Water Quality: Measurements from the Water Quality Portal, a collaboration between the USGS, EPA, and other agencies.
- Facility Compliance: Sourced from the EPA's ECHO Database, detailing facility violations, penalties, and compliance rates.
All data is refreshed regularly and reflects the latest available figures for 2024.