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Peak Daily One-Hour Ozone Averages for August 2019

The table below lists the peak daily one-hour ozone concentrations measured in August 2019 in each community where the Virginia DEQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

Use the selection boxes below to customize this report. You may select a different month, a different year, a different report format, and whether or not to include time on the report. Click on the Generate Report button once you have made your selections.

Month:Year:Report Format: Include time:
Include time
Highlight using AQI colors
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
12345678910111213141516171819202122
Southwest
Rural Retreat1454449504756504850474746414756514953474549471Rural Retreat
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
12345678910111213141516171819202122
Valley
Albemarle High School1525346565855564746474649494853485051585246511Albemarle High School
Frederick Co. Public School Maint. Dept.1605953525764534750453457504855525552446049571Frederick Co. Public School Maint. Dept.
Natural Bridge Station1434655484655545145474848404746454747484348461Natural Bridge Station
Harrisonburg VDOT1585352575157554742484649434350455450484742531Harrisonburg VDOT
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
12345678910111213141516171819202122
Blue Ridge
Herman L. Horn Elementary School1514851534960575050465051474849435147565251531Herman L. Horn Elementary School
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
12345678910111213141516171819202122
Piedmont
Charles City County1784839444743465756495050346641414140536439511Charles City County
Beach Road VDOT1505063445151495348505346465851584643515043451Beach Road VDOT
Hanover1635047486058555655514856514444494546727239671Hanover
MSIC (MathScience Innovation Center)1815252536056536055545550495647486372577743631MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
12345678910111213141516171819202122
Tidewater
NASA Langley Research Center1655043524954465161495765426449564838595135581NASA Langley Research Center
Tidewater Community College1674742494242444154535869404843614439464732471Tidewater Community College
VA Tech Agricultural Research Center1505149444238464846505548404156383831404536381VA Tech Agricultural Research Center
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
12345678910111213141516171819202122
Northern
Aurora Hills Visitor Center1716066617769665855504165555550535450646845641Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1584544555948485155494456414950414441535337471Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1795454617665606153524756456058494947736741631Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area156514555614548514647404842475141NANA456139511Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School16167626052NANANANANANANANANANA645559498450571Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1556247575255555251484952465051484846505147511Shenandoah National Park - Big Meadows
Long Park - Haymarket1626052596957535149483953515362595148458945541Long Park - Haymarket
Widewater Elem. School - Widewater1585151617659545354494353456051464743516839551Widewater Elem. School - Widewater
NA - Data not available.

Interpreting the AQI

Air Quality Index

Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.

Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.

The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.

AQI Breakpoint Definitions
AQI Range 1hr Ozone
in ppm
8hr Ozone
in ppm
0 - 50 Not Defined 0 - 0.054
51 - 100 Not Defined 0.055 - 0.070
101 - 150 0.125 - 0.164 0.071 - 0.085
151 - 200 0.165 - 0.204 0.086 - 0.105
201 - 300 0.205 - 0.404 0.106 - 0.200
301 - 400 0.405 - 0.504 Not Defined
401 - 500 0.505 - 0.604 Not Defined
500+ Not Defined Not Defined

PLEASE NOTE: This data has not been verified by the Virginia DEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from Virginia DEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.