Phoenix Forecast

Image of the skyline of downtown phoenix

Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Tuesday Forecast:

Notice: Blowing dust possible late afternoon/evening

Ozone

67 AQI
Max 8-hr Avg: 60 ppb

PM10

69 AQI
24-hr Avg: 91 µg/m3

PM2.5

34 AQI
24-hr Avg: 8.2 µg/m3

Wednesday Forecast:

Alert: Ozone Health Watch in effect for Wednesday

Ozone

93 AQI
Max 8-hr Avg: 68 ppb

PM10

54 AQI
24-hr Avg: 61 µg/m3

PM2.5

25 AQI
24-hr Avg: 6.1 µg/m3

Thursday Forecast:

Alert: Ozone High Pollution Advisory possible on Thursday

Ozone

101 AQI
Max 8-hr Avg: 71 ppb

PM10

53 AQI
24-hr Avg: 60 µg/m3

PM2.5

26 AQI
24-hr Avg: 6.3 µg/m3

Friday Forecast:


Ozone

87 AQI
Max 8-hr Avg: 66 ppb

PM10

54 AQI
24-hr Avg: 61 µg/m3

PM2.5

25 AQI
24-hr Avg: 6.1 µg/m3

Saturday Forecast:


Ozone

87 AQI
Max 8-hr Avg: 66 ppb

PM10

48 AQI
24-hr Avg: 52 µg/m3

PM2.5

26 AQI
24-hr Avg: 6.2 µg/m3

Air Quality By Pollutant:

Pollutant
Tuesday
4/23/2019
Wednesday
4/24/2019
Thursday
4/25/2019
Friday
4/26/2019
Saturday
4/27/2019
O3
67
93
101
87
87
PM10
69
54
53
54
48
PM2.5
34
25
26
25
26
Pollutant
TUE
WED
THU
FRI
SAT
O3
67
93
101
87
87
PM10
69
54
53
54
48
PM2.5
34
25
26
25
26
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

A wave of low pressure centered over southern Arizona and northwestern Mexico this morning will slowly makes its way southeastward today. This system is expected to result in thunderstorm development in east-central Arizona and Pinal County early this afternoon. For Phoenix, the main concern is the potential for outflow winds to reach the Valley from thunderstorms originating in Pinal County. Since this area is a favorable source for dust, blowing dust may be possible this afternoon/evening. Forecast hourly PM10 (dust) values have been increased to reflect this dust potential.

The good news about the said storms and winds is that they are also expected to interrupt the daily ozone cycle. Assuming outflow winds and clouds reach the Valley early enough in the afternoon, ozone levels shouldn't be able to reach as high.

However, beginning Wednesday, high pressure will begin to build over the Southwest. And by Thursday, it will be the dominating weather pattern. Ozone is thus forecast to increase each day. An Ozone Health Watch has been issued for tomorrow and an Ozone High Pollution Advisory may be possible on Thursday. Morevoer, ozone looks to be elevated throughout the rest of the week.

Lastly, PM10 is forecast in the Moderate Air Quality Index (AQI) category Wednesday-Friday to account for local activity southwest of the Phoenix metro area. Elsewhere around the Valley should see PM10 levels in the Good AQI category.

- M. Graves
ADEQ Meteorologist


What Flag Should I Fly?

Wednesday: Yellow
Thursday: Orange

What is the Flag Program and how can my school/organization join? | Learn More >