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Peak Daily One-Hour Ozone Averages for August 2017

The table below lists the peak daily one-hour ozone concentrations measured in August 2017 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 2017POCMonitoring Site
Rural Retreat1415054523648414744383540493532431Rural Retreat
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Albemarle High School1444955624141364152494037514040571Albemarle High School
Frederick Co. Public School Maint. Dept.1495656613037294150494343463942481Frederick Co. Public School Maint. Dept.
Natural Bridge Station1364249553441274046434037454137501Natural Bridge Station
Harrisonburg VDOT1516551583336343951495046564035561Harrisonburg VDOT
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School1495563673648344452514244454447521Herman L. Horn Elementary School
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Charles City County1565667424746363845463427384343491Charles City County
Beach Road VDOT1605160494150323751593526515127611Beach Road VDOT
MSIC (MathScience Innovation Center)1666074634360354250594135475045651MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
NASA Langley Research Center1607276564948424560484128504636531NASA Langley Research Center
Tidewater Community College1666354445447384355433520434029491Tidewater Community College
VA Tech Agricultural Research Center1584648424741323555562717413426491VA Tech Agricultural Research Center
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Aurora Hills Visitor Center1645768583751404278553842524334591Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1555262683637384451454237493837621Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1615464533746344477503340513935661Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area1444951613642363954524334483730541Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School1496576673540354162635249474533581Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1424651624437414852514939505035NA1Shenandoah National Park - Big Meadows
Long Park - Haymarket1435778623539384155564539463835561Long Park - Haymarket
Widewater Elem. School - Widewater1504857613641384763524344524037631Widewater 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.