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Daily Maximum Eight-Hour Ozone Averages for October 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in October 2018 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 2018POCMonitoring Site
Rural Retreat1354037393328373031292637322138223437453430NA1Rural Retreat
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
Albemarle High School1373836352423343230222937332627193634403431NA1Albemarle High School
Frederick Co. Public School Maint. Dept.1362934302226373432301829292521243332343224NA1Frederick Co. Public School Maint. Dept.
Natural Bridge Station1342933303029322826182635322423183434363531NA1Natural Bridge Station
Harrisonburg VDOT1353031312131343328232133322226223632393528NA1Harrisonburg VDOT
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School1363640383328393331202836342829183735433531NA1Herman L. Horn Elementary School
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
Charles City County146434440203232403726NVNANANV38223234363030NA1Charles City County
Beach Road VDOT1393932361736313635232432302133223131353030NA1Beach Road VDOT
MSIC (MathScience Innovation Center)1434140391833433736262433312634253132373230NA1MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
NASA Langley Research Center1544141442833373535342235354037332935393030NA1NASA Langley Research Center
Tidewater Community College15339NV433631363130302235353535272835382930NA1Tidewater Community College
VA Tech Agricultural Research Center1453935433936373233302230353236263134392930NA1VA Tech Agricultural Research Center
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
Aurora Hills Visitor Center1434742381526283231312031332222273431373126NA1Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1394636311822282827292534302129NV3234363229NA1Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County14140413916232829292621313318NVNVNV333733NVNA1Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area132362930211426292725213128212823NV32363227NA1Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School1394239362126343635352033332623273634353427NA1Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1393937362835383633313139363535273837453929NA1Shenandoah National Park - Big Meadows
Long Park - Haymarket136403532212228343530NV32322723273533363427NA1Long Park - Haymarket
Widewater Elem. School - Widewater1383831311618262627272332282125223233333127NA1Widewater 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.