 Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs
and are intended to be used as a general spatial reference only. They are not a formal
determination of tribal boundaries by the EPA.
Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs
and are intended to be used as a general spatial reference only. They are not a formal
determination of tribal boundaries by the EPA.
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| Air Quality Index (AQI) |
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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: OZONE: Local ozone levels were on the increase again this morning and as of noon hourly concentrations were running from two to 11 parts per billion higher than 24 hours ago at the Glendale and South Phoenix monitoring sites, respectively. There may have been a slight influx of additional ozone and/or its precursors from the west overnight as evidenced by the high ozone levels at the Alamo Lake site in La Paz County. In addition, thru the noon hour metro area gradient winds had not yet increased. Going forward it appears that these diurnal winds will play the largest role in what the highest ozone concentration will be on any given day since the current synoptic weather pattern is rather persistent. Since wind speeds in the 15-25 mph range are still expected, highest ozone levels are predicted to go no higher the mid-moderate range of the Air Quality Index. PARTICLES: A fairly significant upper level trough is projected to be over the western U.S. into the upcoming weekend. For the Phoenix metro area this means dry and hot weather conditions with breezy to gusty westerly up-slope gradient winds each afternoon. Due to the current dry spell (no rainfall of note since April 9) there continue to be intermittent elevated to high PM-10 (coarse particle) concentrations due to fugitive dust emissions – such as the 540ug/m3 reading at the Higley monitoring site and 275ug/m3 at Buckeye – both occurring around 8:00 a.m. today. Highest forecast PM-10 AQI levels have been returned into low-moderate range and PM-2.5 (fine particle) readings should remain in the good range of the AQI. |
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Action Day
