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Daily Maximum Eight-Hour Ozone Averages for August 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in August 2017 in each community where the Virginia DEQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Rural Retreat137464749334128444235313443313039361Rural Retreat
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Albemarle High School141455159353830384946363249363553441Albemarle High School
Frederick Co. Public School Maint. Dept.144464756293223354746373743313345461Frederick Co. Public School Maint. Dept.
Natural Bridge Station133374350323622344340363241372844361Natural Bridge Station
Harrisonburg VDOT145524754313427364844434053323148421Harrisonburg VDOT
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School142435458344425414748363941393650391Herman L. Horn Elementary School
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Charles City County151495639424228334343262335363143291Charles City County
Beach Road VDOT1504854463943252947532924454722NV331Beach Road VDOT
MSIC (MathScience Innovation Center)157576756414930374954343244453456431MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
NASA Langley Research Center1NV586447444535385646362144423144551NASA Langley Research Center
Tidewater Community College159494840484331NV5241271637322445451Tidewater Community College
VA Tech Agricultural Research Center15239NV40423826305251231637282243401VA Tech Agricultural Research Center
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
Aurora Hills Visitor Center155545754344422396452333549412555461Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory150435361353429384742302745333049441Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County156495148354022416446303049362957381Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area139424656333628344944322345322642411Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School145526264333829385655414444362854521Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows14242575936353646484543434846NVNANA1Shenandoah National Park - Big Meadows
Long Park - Haymarket141486357323727365052403644312452421Long Park - Haymarket
Widewater Elem. School - Widewater146445054343630405546343148353152451Widewater Elem. School - Widewater
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.