Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Friday Forecast:


Ozone

42 AQI
Max 8-hr Avg: 45 ppb

PM10

52 AQI
24-hr Avg: 57 µg/m3

PM2.5

58 AQI
24-hr Avg: 15.2 µg/m3

Saturday Forecast:


Ozone

41 AQI
Max 8-hr Avg: 44 ppb

PM10

38 AQI
24-hr Avg: 41 µg/m3

PM2.5

65 AQI
24-hr Avg: 18.8 µg/m3

Sunday Forecast:


Ozone

39 AQI
Max 8-hr Avg: 42 ppb

PM10

39 AQI
24-hr Avg: 42 µg/m3

PM2.5

76 AQI
24-hr Avg: 24.2 µg/m3

Monday Forecast:


Ozone

39 AQI
Max 8-hr Avg: 42 ppb

PM10

51 AQI
24-hr Avg: 55 µg/m3

PM2.5

63 AQI
24-hr Avg: 18.0 µg/m3

Tuesday Forecast:


Ozone

40 AQI
Max 8-hr Avg: 43 ppb

PM10

52 AQI
24-hr Avg: 57 µg/m3

PM2.5

64 AQI
24-hr Avg: 18.2 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
12/14/2018
Saturday
12/15/2018
Sunday
12/16/2018
Monday
12/17/2018
Tuesday
12/18/2018
O3
42
41
39
39
40
CO
20
19
18
20
20
PM10
52
38
39
51
52
PM2.5
58
65
76
63
64
Pollutant
FRI
SAT
SUN
MON
TUE
O3
42
41
39
39
40
CO
20
19
18
20
20
PM10
52
38
39
51
52
PM2.5
58
65
76
63
64
O3 = Ozone, CO = Carbon Monoxide, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Clouds have already begun to move over Arizona from the west this morning. Cloud cover looks to be possible through the weekend and on Monday as well. Skies should then clear out more on Tuesday as high pressure begins to build over the region. In general, light winds and stagnant conditions are expected each day through at least Tuesday. Also, high temperatures will be their warmest--low 70s--Saturday and Sunday.

Air quality-wise, not much is expected to change from what we have been seeing lately. Stagnant conditions will be favorable for accumulation of PM10 (dust) and PM2.5 (smoke, soot) in the morning and overnight hours, but mainly PM2.5. As a result, PM2.5 is expected to finish in the Moderate Air Quality Index (AQI) category each day of this forecast period. PM10 will also have the potential to reach the Moderate category, but more so on weekdays.

Locations south and southwest of the Phoenix metro area will have the greatest potential at seeing Moderate AQI levels for either pollutant. But locations elsewhere around the Valley could also see Moderate PM2.5 levels over the weekend.

The main concern, however, is Saturday night into Sunday. Last Sunday (12/9), PM2.5 exceeded the federal health standard, primarily because of high PM2.5 levels in the morning. Whether or not a similar outcome will happen this weekend is uncertain, but forecast hourly PM2.5 levels on Sunday have been increased to account for the possibility of higher levels.

- M. Graves
ADEQ Meteorologist


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Friday: Yellow
Saturday: Yellow

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