Delaware is under another air quality alert due to lasting effects of the Canadian wildfires.
The Delaware Department of Natural Resources and Environmental Control issued a “Code Orange Air Quality Action Day” on Wednesday morning due to elevated concentrations of particulate matter 2.5 from Canadian wildfire smoke.
PM 2.5 is defined as fine, inhalable particles or droplets in the air with diameters of 2.5 micrometers and smaller.
The National Weather Service also issued an air quality advisory for the entire state.
What does this mean?
According to DNREC, light west-northwesterly winds were to bring smoke into Delaware into the early afternoon, while a trough of low pressure was to depart to the east.
This movement caused the Air Quality Index levels to be unhealthy for sensitive groups, defined as “code orange.” The general public is less likely to be affected.
The AQI reveals how clean or polluted air is and what associated health effects might be a concern within a few hours or days of breathing the polluted air. AQI levels are categorized in six levels, ranging from green to maroon as they increase in severity and impact.
Aside from being unhealthy for sensitive groups, the orange zone has an AQI range of 101 to 150. At 5 p.m. Wednesday, the AQI was 134 in New Castle County, 100 in Kent County and 80 in Sussex County.
How long will the air quality impact last?
DNREC predicts that AQI levels will continue to be in the “unhealthy for sensitive groups” category for PM 2.5 on Thursday as winds transport additional smoke into the region.
The smoke will contribute to ozone precursors, too, due to sunny skies and the highs in the mid-80s enhancing ozone formation. As a result, the AQI levels for ozone are expected to increase to high-moderate.
As of Wednesday afternoon, the ozone quality in Delaware was categorized as good with a value of 50.
On Friday, DNREC anticipates improved conditions as southeasterly winds begin to lift the smoke to the north.
Lingering smoke will recirculate into the region from the south and warm temperatures will continue to support ozone impacts, causing AQI levels to remain high-moderate.
Got a tip or a story idea? Contact Krys’tal Griffin atkgriffin@delawareonline.com.
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