The highest AQ index in Delaware (as of 2:00 EDT) is currently the Greater New Castle County area. Particle Pollution (PM2.5) is measuring at 37 (Good). This means air quality is satisfactory, and air pollution poses little or no risk.
Over the next few days, the highest Ozone (OZONE) will be in the Greater New Castle County area. It is forecasted to be Moderate, meaning air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Tuesday, August 18: Partly sunny skies and temperatures in the upper-80s will enhance ozone formation. In addition, periods of light and variable winds will allow ozone precursors and other pollutants to accumulate. Therefore, AQI levels are anticipated to be mid-Moderate for ozone and low-Moderate for PM2.5. Wednesday, as surface high pressure builds in from the west, southwesterly winds will carry regional pollutants into Delaware. Additionally, mostly sunny skies and temperatures near 90F will continue to support ozone production. These conditions are anticipated to keep AQI levels mid-Moderate for ozone and low-Moderate for PM2.5. Thursday, as a cold front gradually moves across the First State, northwesterly winds will aid dispersion. Furthermore, increasing clouds and scattered thunderstorms will reduce ozone formation. Thus, AQI levels are anticipated to be high-Good for ozone and PM2.5.
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
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Below is a list of counties in Delaware. Click on any county below and you'll get a list of cities where we provide AQ index forecasts.
| Kent | New Castle | Sussex |