Tucson Area Forecast
AQI Scale
Air Quality UPDATED: Thu. Apr 19, 2018 12:52 PM
This report is updated Monday through Friday and is valid for areas within and bordering Tucson, Arizona
Today | Thursday 4/19/2018
88
PM10
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Notice:Blowing Dust Possible
Tomorrow | Friday 4/20/2018
69
PM10
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Notice:Morning Haze Possible
Extended | Saturday 4/21/2018
80
Ozone
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Sunday 4/22/2018
84
Ozone
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Monday 4/23/2018
87
Ozone
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.

Air Pollutant Breakdown
Pollutant Yesterday
4/18/2018
Thursday
4/19/2018
Friday
4/20/2018
Saturday
4/21/2018
Sunday
4/22/2018
Monday
4/23/2018
O3 90 58 61 80 84 87
PM10 58 88 69 37 38 44
O3 = Ozone, PM10 = Particles 10 microns and smaller

Synopsis & Discussion
Forecaster: -M. Pace
Yesterday, ozone was elevated nearly state-wide. Phoenix exceeded the Health Standard for ozone; while Tucson came in with an AQI of 90 (below the standard). As for PM-10, Rillito saw some spikes yesterday late night which allowed them to end the day in the low Moderate AQI category while the rest of the Tucson area was in the Good range.

Today, our attention quickly turns to wind and dust. A strong area of low pressure currently moving through California will sweep through the region today bringing with it gusty winds in the 25-35mph range. These winds will be strong enough to pick up areas of blowing dust; however, the duration of this wind event is not anticipated to be long enough to result in PM-10 reaching the 24-hour Federal Health Standard. As a result, a Health Watch or Advisory will not be issued for today.

Tomorrow, as the storm system continues moving eastward, winds will switch around during the morning and be out of the northwest which will transport any leftover dust from Pinal County into the Tucson area. This will mean haze is possible Friday morning along with elevated PM-10.

High pressure will build into the region this weekend through the first part of next week which will result in clear skies and calm winds. This pattern will allow ozone to rise into the upper Moderate AQI category. We will be watching trends very closely.

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