Tucson Area Forecast
AQI Scale
Air Quality UPDATED: Mon. Jul 23, 2018 8:49 AM
This report is updated Monday through Friday and is valid for areas within and bordering Tucson, Arizona
Today | Monday 7/23/2018
90
Ozone
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Tomorrow | Tuesday 7/24/2018
93
Ozone
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Wednesday 7/25/2018
90
Ozone
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Thursday 7/26/2018
80
Ozone
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Friday 7/27/2018
80
Ozone
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.

Air Pollutant Breakdown
Pollutant Yesterday
7/22/2018
Monday
7/23/2018
Tuesday
7/24/2018
Wednesday
7/25/2018
Thursday
7/26/2018
Friday
7/27/2018
O3 74 90 93 90 80 80
PM10 18 30 31 30 29 28
O3 = Ozone, PM10 = Particles 10 microns and smaller

Synopsis & Discussion
Forecaster: -R. Nicoll
A strong ridge is dominating the western half of the United States, which is causing excessive heat over the region. In addition to the heat, conditions are also conducive for a greater accumulation of ozone, that being calm winds and plenty of sunshine. As a result, ozone Health Watches are in effect for today and tomorrow, and a possible Health Watch on Wednesday as well. Slightly better winds and more cloud cover later in the week should drop ozone levels out of the HW range. As for PM10, we aren't expecting any major issues. Isolated thunderstorms during the afternoon/evening hours in the area are possible this week, but any outflow winds likely won't kick up much dust due to the recent rains. As we continue to move further into the monsoon season, the threat of blowing dust will decrease due to more stable soils from the rain. PM10, is forecast to stay in the Good AQI range through the forecast period.

What Flag Should I Fly?
Monday: Yellow
Tuesday: Yellow

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