Phoenix Forecast
AQI Scale
Air Quality ISSUED ON: Fri. Jan 19, 2018
This report is updated Monday through Friday and is valid for areas within and bordering Phoenix, Arizona
Today | Friday 1/19/2018
52
PM2.5
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Tomorrow | Saturday 1/20/2018
60
PM10
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Notice:Hazy conditions possible
Extended | Sunday 1/21/2018
52
PM2.5
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Monday 1/22/2018
59
PM2.5
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.
Extended | Tuesday 1/23/2018
60
PM2.5
MessageHealth Statement:Unusually sensitive people should consider reducing prolonged outdoor exertion.

Air Pollutant Breakdown
Pollutant Yesterday
1/18/2018
Friday
1/19/2018
Saturday
1/20/2018
Sunday
1/21/2018
Monday
1/22/2018
Tuesday
1/23/2018
O3 41 42 44 41 41 42
CO 19 14 14 16 18 19
PM10 65 51 60 51 53 54
PM2.5 57 52 57 52 59 60
O3 = Ozone, CO = Carbon Monoxide, PM10 = Particles 10 microns and smaller, PM2.5 = Particles smaller than 2.5 microns

Synopsis & Discussion
Forecaster: -R. Nicoll
The trough we've been discussing the past few days is now baring down on the west coast and will be influencing our weather and air quality through the weekend. Typical morning particulate issues are occurring this morning as we are still under pretty stagnant conditions. Beginning this afternoon, we should see some improvement as ventilation increases from the approaching weather system. However, as winds strengthen tomorrow across the state, we do think there will be potential for some dust. We are forecasting a hazy afternoon tomorrow due to dust being kicked up in southeastern California/southwestern Arizona and carried our way. Therefore, we are forecasting some elevated particulate levels tomorrow which could linger a bit into Sunday. By the start of next week we should return to typical morning and evening particulates due to more stagnant conditions. On a side note, the cold front will bring much cooler temperatures beginning tomorrow, but unfortunately, any rain we see here in Phoenix will likely be very light.

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