Tucson Area Forecast
AQI Scale
Air Quality ISSUED ON: Thu. Feb 22, 2018
This report is updated Monday through Friday and is valid for areas within and bordering Tucson, Arizona
Today | Thursday 2/22/2018
50
PM10
MessageHealth Statement:No health impacts are expected.
Tomorrow | Friday 2/23/2018
55
PM10
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Saturday 2/24/2018
41
Ozone
MessageHealth Statement:No health impacts are expected.
Extended | Sunday 2/25/2018
43
Ozone
MessageHealth Statement:No health impacts are expected.
Extended | Monday 2/26/2018
45
Ozone
MessageHealth Statement:No health impacts are expected.

Air Pollutant Breakdown
Pollutant Yesterday
2/21/2018
Thursday
2/22/2018
Friday
2/23/2018
Saturday
2/24/2018
Sunday
2/25/2018
Monday
2/26/2018
O3 44 44 40 41 43 45
PM10 30 50 55 40 35 41
O3 = Ozone, PM10 = Particles 10 microns and smaller

Synopsis & Discussion
Forecaster: -M. Pace
Good air quality across the Tucson area yesterday and that trend will continue today, but another storm is moving toward the region and will result in elevated levels of dust tomorrow.

A storm system seen on water vapor satellite this morning over the Pacific Northwest will continue moving southeastward today. This storm will move through the Great Basin before diving into Arizona Friday through Saturday morning. Since this storm has an overland trajectory, expecting it to be fairly moisture starved so rain chances will be slim and any rain that does fall will be light. The main concern air quality wise with this storm will be strong winds. Currently forecasting winds to increase late tomorrow morning through the evening hours with gusts in the 20-25mph range. As a result, will increase PM-10 levels since winds will be out of the west.

The storm will quickly move eastward by Saturday afternoon allowing winds to calm through at least Sunday. For early next week, a broad trough will remain over the Western US allowing several more storms to move through the region increasing breezes from time-to-time. Stay tuned for more details as these storms move closer.

Bottom line, expect windy conditions tomorrow with cooler temperatures (high temps in the upper 50's to low 60's) this weekend.

Useful Links
- Pima County Department of Environmental Quality
- Subcribe to the Forecast
- Yesterday's Monitor Data
- Read current issue of "Cracking the AQ Code"


Main Office
1110 W.Washington Street
Tucson, AZ 85007
P: 602.771.2300
azdeq.gov