Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Friday Forecast:


Ozone

45 AQI
Max 8-hr Avg: 49 ppb

PM10

64 AQI
24-hr Avg: 82 µg/m3

PM2.5

60 AQI
24-hr Avg: 16.5 µg/m3

Saturday Forecast:


Ozone

46 AQI
Max 8-hr Avg: 50 ppb

PM10

58 AQI
24-hr Avg: 70 µg/m3

PM2.5

61 AQI
24-hr Avg: 16.9 µg/m3

Sunday Forecast:


Ozone

45 AQI
Max 8-hr Avg: 49 ppb

PM10

53 AQI
24-hr Avg: 60 µg/m3

PM2.5

63 AQI
24-hr Avg: 17.7 µg/m3

Monday Forecast:


Ozone

46 AQI
Max 8-hr Avg: 50 ppb

PM10

64 AQI
24-hr Avg: 81 µg/m3

PM2.5

60 AQI
24-hr Avg: 16.6 µg/m3

Tuesday Forecast:


Ozone

45 AQI
Max 8-hr Avg: 49 ppb

PM10

62 AQI
24-hr Avg: 77 µg/m3

PM2.5

56 AQI
24-hr Avg: 14.3 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
11/16/2018
Saturday
11/17/2018
Sunday
11/18/2018
Monday
11/19/2018
Tuesday
11/20/2018
O3
45
46
45
46
45
CO
11
9
9
11
11
PM10
64
58
53
64
62
PM2.5
60
61
63
60
56
Pollutant
FRI
SAT
SUN
MON
TUE
O3
45
46
45
46
45
CO
11
9
9
11
11
PM10
64
58
53
64
62
PM2.5
60
61
63
60
56
O3 = Ozone, CO = Carbon Monoxide, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

As we move deeper into the cold season, the topic of the inversion will return. The inversion is a warm layer of air just above the ground that acts like a lid, allowing particulate pollution (PM10 and PM2.5) to accumulate near the ground overnight. With cooler morning temperatures, the inversion is stronger, which means more time for particulates to accumulate.

We've already begun to see the first signs of greater morning accumulations of particulates, specifically in areas south and southwest of the Phoenix metro area. Just yesterday, PM10 levels reached an Air Quality Index of 72 at the West 43rd monitor and PM2.5 an AQI of 69 at the Durango monitor.

Through this forecast period, weather conditions will continue to be cooler and mild. High temperatures will hover in the low-mid 70s, near normal actually, which is about 75°F; lows will stay around 50°F or slightly cooler. Winds will also remain mostly light. Because of the stagnant, cool morning conditions each day, elevated PM10 and PM2.5 will be possible in the mornings, as well as overnight. As a result, both pollutants will have the potential to reach the Moderate AQI category each day. But areas south and southwest of the Phoenix metro area will be the most likely to see particulate levels reach Moderate--particulate levels elsewhere around the Valley may stay in the Good category.

Furthermore, particulate levels are typically lowest during the afternoon hours because of daytime heating.

- M. Graves
ADEQ Meteorologist


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