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 Action Day
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Air Quality Index (AQI)
observed at 4:00 EDT
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Health Message: None |
Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the Hazardous category. Additional information on reducing exposure to extremely high levels of particle pollution is available here. |
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Moderate |
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Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. |
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Data Not Available |
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Data Not Available |
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Forecast Discussion: FORECAST SUMMARY: Friday, August 16th, 2019 through Monday, August 19th, 2019 Ozone: 8-hour Ozone concentrations will range from Good to Moderate through the forecast period. PM-2.5: 24-hour Fine Particulate concentrations will range from Good to low-Moderate. FORECAST DISCUSSION: Systems will bring on and off chances for precipitation through the weekend. The first chance will be Friday evening/night; Saturday should be mostly dry; but precipitation chances return Sunday. A stronger front moves through later Monday/Tuesday cooling conditions down by mid-week. As for air quality, seasonable surface temperatures, coupled with cooler upper level temperatures and at least scattered cloud cover, will keep ozone from reaching higher than Moderate Friday or Saturday. By Sunday, surface and upper level temperatures increase along with dew point readings. Clouds and precipitation associated with a system nearby should again keep ozone from reaching higher than Moderate. Less cloud cover is expected Monday with warmer temperatures continuing; however, the system passing through Sunday should allow for more northerly/westerly winds. Currently, we don’t expect ozone to get higher than Moderate on Monday. If our thoughts on this change over the weekend, then this forecast will be updated Sunday morning. Without much of a stagnant period though early next week we do not anticipate any significant build-up of fine particulate. Readings should range from middle Good to low Moderate. EXTENDED FORECAST: Extended models show cooler conditions by mid-week allowing for Good air quality. Forecast updated by Stephanie Hengesbach: Friday, August 16th, 2019 Next forecast update: Monday, August 19th, 2019 |
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AQI: Good (0 - 50)
AQI: Moderate (51 - 100)
AQI: Unhealthy for Sensitive Groups (101 - 150) 
AQI: Unhealthy (151 - 200) 
AQI: Very Unhealthy (201 - 300)
AQI: Hazardous (301 - 500)
National Parks/Monuments
Tribal Boundaries
