Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Thursday Forecast:


Ozone

40 AQI
Max 8-hr Avg: 43 ppb

PM10

36 AQI
24-hr Avg: 39 µg/m3

PM2.5

52 AQI
24-hr Avg: 12.7 µg/m3

Friday Forecast:


Ozone

39 AQI
Max 8-hr Avg: 42 ppb

PM10

43 AQI
24-hr Avg: 46 µg/m3

PM2.5

65 AQI
24-hr Avg: 18.6 µg/m3

Saturday Forecast:


Ozone

38 AQI
Max 8-hr Avg: 41 ppb

PM10

31 AQI
24-hr Avg: 34 µg/m3

PM2.5

74 AQI
24-hr Avg: 22.8 µg/m3

Sunday Forecast:


Ozone

36 AQI
Max 8-hr Avg: 39 ppb

PM10

30 AQI
24-hr Avg: 32 µg/m3

PM2.5

75 AQI
24-hr Avg: 23.7 µg/m3

Monday Forecast:


Ozone

40 AQI
Max 8-hr Avg: 43 ppb

PM10

43 AQI
24-hr Avg: 46 µg/m3

PM2.5

71 AQI
24-hr Avg: 21.5 µg/m3

Air Quality By Pollutant:

Pollutant
Thursday
12/5/2019
Friday
12/6/2019
Saturday
12/7/2019
Sunday
12/8/2019
Monday
12/9/2019
O3
40
39
38
36
40
PM10
36
43
31
30
43
PM2.5
52
65
74
75
71
Pollutant
THU
FRI
SAT
SUN
MON
O3
40
39
38
36
40
PM10
36
43
31
30
43
PM2.5
52
65
74
75
71
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

The rain that weather forecast models had been advertising for last night did not really pan out--it was mainly limited to the early morning hours yesterday. However, particulate matter levels still remained low: PM10 (dust) stayed in the Good Air Quality Index (AQI) category at all monitoring sites around the Valley; PM2.5 (smoke, soot) reached the Moderate AQI category at only two monitors west of the Phoenix metro area.

Today, high pressure will move over Arizona and result in mostly sunny skies and light winds for the Valley. In fact, this pattern will usher in a period of mild weather conditions: high temperatures will hover in the low 70s and winds will stay mostly light throughout the next several days. However, cloud cover will increase again Friday and over the weekend as subtropical moisture streams in over the state behind the high pressure. Another weak low pressure wave is then forecast to dive over Arizona from the northwest late Sunday into Monday. Small rain chances enter the forecast again, and daytime winds could increase out of the west on Sunday. Higher pressure and mostly light winds follow on Monday.

Air quality-wise, in general, the mild weather conditions will be favorable for the local build-up of PM10 and PM2.5 in the Valley in the mornings/evenings each day. The good news is that PM10 will have a decent shot at remaining in the Good AQI category, especially over the weekend (local weekday activity ceasing). However, PM2.5 is expected to reach the Moderate AQI category each day through at least Monday.

In fact, higher PM2.5 levels are possible over the weekend, since this is the time of year for increased residential fireplace usage. And though Sunday remains somewhat of a wildcard because of the potential for rain, light evening winds would be favorable for PM2.5 build-up.

- M. Graves
ADEQ Meteorologist


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Friday: Yellow

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