Phoenix Forecast
AQI Scale
Air Quality ISSUED ON: Fri. Nov 24, 2017
This report is updated Monday through Friday and is valid for areas within and bordering Phoenix, Arizona
Today | Friday 11/24/2017
69
PM2.5
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Tomorrow | Saturday 11/25/2017
64
PM2.5
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Sunday 11/26/2017
62
PM2.5
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Monday 11/27/2017
88
PM10
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Notice:Haze possible
Extended | Tuesday 11/28/2017
61
PM10
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.

Air Pollutant Breakdown
Pollutant Yesterday
11/23/2017
Friday
11/24/2017
Saturday
11/25/2017
Sunday
11/26/2017
Monday
11/27/2017
Tuesday
11/28/2017
O3 40 44 41 40 38 39
CO 26 19 18 17 16 18
PM10 58 61 63 58 88 61
PM2.5 78 69 64 62 68 59
O3 = Ozone, CO = Carbon Monoxide, PM10 = Particles 10 microns and smaller, PM2.5 = Particles smaller than 2.5 microns

Synopsis & Discussion
Forecaster: -R. Nicoll
PM-10 yesterday, and so far today, has been doing better than anticipated. PM-2.5 has remained higher in the Moderate range, likely due to an increase in fireplace activity for the holiday. Particulates are now forecast to stay in the mid Moderates for the weekend. The primary day of concern looks to be Monday. A fairly strong trough looks like it will push its way through the region. Winds associated with the trough may be enough to kick up some dust down in southeastern California/southwestern Arizona and drift the dust over central Arizona. If this happens, you can expect Monday to be a hazy day, with PM-10 levels reaching the upper Moderate AQI range.

Ozone will not be a concern during the forecast period. There is too little daylight hours for a significant amount of ozone to form. Ozone is forecast to stay in the Good AQI range.

Useful Links
- Subcribe to the Forecast
- Yesterday's Monitor Data
- Year-to-Date Reports
- Maricopa County Air Monitoring Site
- Read current issue of "Cracking the AQ Code"


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