Phoenix Forecast

Image of the skyline of downtown phoenix

Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Wednesday Forecast:

Alert: Ozone Health Watch in effect for Wednesday

Ozone

93 AQI
Max 8-hr Avg: 68 ppb

PM10

56 AQI
24-hr Avg: 66 µg/m3

PM2.5

30 AQI
24-hr Avg: 7.2 µg/m3

Thursday Forecast:


Ozone

67 AQI
Max 8-hr Avg: 60 ppb

PM10

54 AQI
24-hr Avg: 61 µg/m3

PM2.5

28 AQI
24-hr Avg: 6.7 µg/m3

Friday Forecast:


Ozone

58 AQI
Max 8-hr Avg: 57 ppb

PM10

53 AQI
24-hr Avg: 59 µg/m3

PM2.5

24 AQI
24-hr Avg: 5.8 µg/m3

Saturday Forecast:


Ozone

58 AQI
Max 8-hr Avg: 57 ppb

PM10

48 AQI
24-hr Avg: 52 µg/m3

PM2.5

26 AQI
24-hr Avg: 6.2 µg/m3

Sunday Forecast:


Ozone

77 AQI
Max 8-hr Avg: 63 ppb

PM10

40 AQI
24-hr Avg: 43 µg/m3

PM2.5

27 AQI
24-hr Avg: 6.4 µg/m3

Air Quality By Pollutant:

Pollutant
Wednesday
6/19/2019
Thursday
6/20/2019
Friday
6/21/2019
Saturday
6/22/2019
Sunday
6/23/2019
O3
93
67
58
58
77
PM10
56
54
53
48
40
PM2.5
30
28
24
26
27
Pollutant
WED
THU
FRI
SAT
SUN
O3
93
67
58
58
77
PM10
56
54
53
48
40
PM2.5
30
28
24
26
27
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Today, higher pressure will move over Arizona, causing winds throughout the atmosphere over the state to weaken. Air quality-wise, this will result in conditions favorable for ozone accumulation near the ground. And as typical, highest ozone levels are expected in the northeast part of the Valley later this afternoon. In all, ozone is still forecast in the 90-100 Air Quality Index (AQI) category, which means an Ozone Health Watch is in effect for today.

Tomorrow (Thursday), a large pattern of low pressure will expand over the northwest quadrant of the U.S. This will ultimately force winds over Arizona to increase out of the southwest during the afternoon. Because of these winds, ozone levels are forecast to decrease. However, ozone is still expected to have the potential to reach into the Moderate AQI category.

On Friday, a trough of low pressure will then begin to swing through Arizona, resulting in winds strengthening even more out of the southwest (15-20 mph with higher gusts). Ozone levels are thus forecast to further decrease. Additionally, localized pockets of dust may be possible, but PM10 (dust) is still forecast in the Good AQI category.

On Saturday, as the aforementioned trough of low pressure passes over Arizona, atmospheric conditions should continue to favor lower ozone levels. Ozone is then forecast to increase again on Sunday.

Regarding PM10, PM10 is forecast in the Moderate AQI category on weekdays to account for local dust-producing activities southwest of the Phoenix metro area. Elsewhere around the Valley, PM10 should remain in the Good AQI category each day.

Woodbury Wildfire Note: The Woodbury fire in the Superstition wilderness area will continue to be active throughout this week; a high smoke column will thus be visible from the fire each afternoon. The good news is that smoke does not appear to be affecting near-ground PM2.5 (fine particulates, such as found in smoke and soot) levels in the Valley. However, a haze may be visible higher off the ground over northeast/east parts of the Valley this morning.

- M. Graves
ADEQ Meteorologist


What Flag Should I Fly?

Wednesday: Yellow
Thursday: Yellow

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