Delaware, Iowa Air Quality
Delaware has a median AQI of 29, earning an air quality grade of A+ — excellent air quality that ranks better than 93% of US cities. Air quality has remained relatively stable over the past decade. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2017, Delaware recorded 43 good air quality days (80% of monitored days).
Population: 138 • County: Delaware
Current AQI
Quick Facts
| Current AQI | 23 — Good |
| Air Quality Grade | A+ |
| Median AQI (2017) | 29 |
| vs. U.S. Cities | Better than 93% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | → Stable |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Delaware is sourced from the Potosi monitoring area, located approximately 36 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Delaware has relatively consistent air quality throughout the year without a strong seasonal peak. Air quality is primarily influenced by local traffic, industrial activity, and regional weather patterns rather than a single seasonal driver.
AQI Trend (10 Years)
Air Quality Days by Year
Delaware Median AQI by Year
Annual EPA air quality data for Delaware — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2017 | 29 | 43 | — | 70 | PM2.5 |
| 2016 | 31 | 99 | — | 81 | PM2.5 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2017 Air Quality Summary
Primary Pollutant Days (2017)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Delaware Air Quality
What is the air quality in Delaware today?
The current AQI in Delaware is 23, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Delaware getting better or worse?
Air quality in Delaware has been stable. The median AQI has dropped 2 points (from 31 in 2016 to 29 in 2017).
What is the most common air pollutant in Delaware?
PM2.5 is the primary air pollutant in Delaware, responsible for 52 days (96% of monitored days) in 2017. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Delaware have per year?
In 2017, Delaware recorded 80% good air quality days (43 days) out of 54 monitored days. There were 0 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 70.
What air quality grade does Delaware receive?
Delaware receives an air quality grade of A+, placing it better than 93% of US cities. This is based on a median AQI of 29 in 2017, with 43 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 93% of US cities
Nearby Cities
Get AQI Alerts
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National Rankings
See how Delaware compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Delaware
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