25 May 2020

High Pollution Ozone Warning + Excessive Heats

The previously issued Ozone High Pollution Advisory for today will remain in effect and be extended for Tuesday, May 26th.
Friday, high pressure’s grip on the Desert Southwest bolsters and another Ozone High Pollution Advisory is possible.
Please keep in mind that although ozone fluctuates daily, the week in Phoenix is going to get progressively hotter! Eventually, the 110 degree realm is likely. 
The National Weather Service is covering that aspect in detail. They have issued a host of heat related warnings

Air Quality Hourly Forecast | Phoenix

Updated On: 5/25/2020 - 9:42 AM
Click on each day to view forecast.

Monday Forecast:

Alert: Ozone High Pollution Advisory in effect for Monday

Ozone


101 AQI
Max 8-hr Avg: 71 ppb

PM10


26 AQI
24-hr Avg: 28 µg/m3

PM2.5


22 AQI
24-hr Avg: 5.3 µg/m3

Air Quality By Pollutant:

Pollutant
Monday
5/25/2020
Tuesday
5/26/2020
Wednesday
5/27/2020
Thursday
5/28/2020
Friday
5/29/2020
O3
101
105
80
77
101
PM10
26
49
47
44
45
PM2.5
22
32
31
28
29
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns 

Forecast Discussion:

Decent air quality so far this holiday weekend! Mild mornings followed by warm, but seasonable, afternoons and breeziness have been the constants in the Phoenix metropolitan. Today, you may notice a rise in temperatures (yes, back to the 100s again) and paring back of breezes. The weather pattern is undertaking a large-scale transition in favor of high pressure ridging. Winds bounded by the surface and 10,000 feet begin to subside. Between that and plenty of sunshine the environment supports an upward trend for ozone. The previously issued Ozone High Pollution Advisory for today will remain in effect and be extended for Tuesday, May 26th.

High pressure development becomes censored briefly on Wednesday and Thursday with a passing low pressure wave in the Great Basin country near Utah. For us, the afternoon mountain-valley circulation strengthens in response to a tighter pressure gradient facilitating our wind speeds. The faster daytime westerly flow limits peak ozone residency time over any one location, so we are forecasting a corresponding drop in maximum 8-hour average ozone values below the health standard midweek. Friday, high pressure’s grip on the Desert Southwest bolsters and another Ozone High Pollution Advisory is possible.

Please keep in mind that although ozone fluctuates daily, the week in Phoenix is going to get progressively hotter! Eventually, the 110 degree realm is likely. The National Weather Service is covering that aspect in detail. They have issued a host of heat related warnings.

Enjoy the rest of the holiday! Stay cool, hydrated, and safe traveling if making your way back to the city after the long weekend.


- J. Malloy
ADEQ Meteorologist 

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Monday: Orange
Tuesday: Orange

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Phoenix Air Quality
ISSUED ON: Monday, May 25, 2020

View the Phoenix Hourly Forecast >

These forecasts are based on the Environmental Protection Agency (EPA)'s AQI federal health standards and are issued for the following areas:
The AQI Forecast lets the public know expected air quality conditions and provides advice about what they can do to protect their health, especially that of children, seniors and people with respiratory problems. 
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