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Daily Maximum Eight-Hour Ozone Averages for October 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in October 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 SitePOCOctober 2017POCMonitoring Site
Rural Retreat13638454350513019242937332344343437NA1Rural Retreat
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Albemarle High School13341474949563617213226222029283332NA1Albemarle High School
Frederick Co. Public School Maint. Dept.13338524742544212203218202126293034NA1Frederick Co. Public School Maint. Dept.
Natural Bridge Station13340444545543115192227262830333433NA1Natural Bridge Station
Harrisonburg VDOT13341454747544022193221182331333133NA1Harrisonburg VDOT
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School13640464751553315222429282236343436NA1Herman L. Horn Elementary School
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Charles City County13237413839362013142422252319322836NA1Charles City County
Beach Road VDOT13447444139362414162019242019302432NA1Beach Road VDOT
MSIC (MathScience Innovation Center)13544434742432517172723272221312734NA1MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
NASA Langley Research Center13540404043383019192628333226282835NA1NASA Langley Research Center
Tidewater Community College13638403541352717171619302926273235NA1Tidewater Community College
VA Tech Agricultural Research Center13341443841332316181722272520292234NA1VA Tech Agricultural Research Center
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
Aurora Hills Visitor Center1404543NV45553516193729262322333130NA1Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory13338424746503213203026292225333330NA1Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County14144444344563414163628272422303229NA1Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area13539494440493515193526261830303234NA1Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School136464846506038182035NV252031313433NA1Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows13343454952584521263131303741403235NA1Shenandoah National Park - Big Meadows
Long Park - Haymarket13745484749593818183726NV1930303233NA1Long Park - Haymarket
Widewater Elem. School - Widewater13641434443513313183230302425323331NA1Widewater 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.