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Daily Maximum Eight-Hour Ozone Averages for March 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in March 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 SitePOCMarch 2017POCMonitoring Site
Rural Retreat1404342434748454853444445444041NV364436434749515246401Rural Retreat
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
Albemarle High School140434044433647495343NVNANV404447484240404146475250351Albemarle High School
Frederick Co. Public School Maint. Dept.140383940433133475241414143404444474336423943NV4548351Frederick Co. Public School Maint. Dept.
Natural Bridge Station141434045434146495245454643424446464538414349485350281Natural Bridge Station
Harrisonburg VDOT141404042413639484843444444404547444339373945475149211Harrisonburg VDOT
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School14142414445444649504344454440NV45454337424548495248371Herman L. Horn Elementary School
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
Charles City County134434043424445475243454342394346494346414445465044211Charles City County
Beach Road VDOT136444143434852485243454439414447534541424347455048291Beach Road VDOT
MSIC (MathScience Innovation Center)135434042434348464942444342384145494244424146454847241MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
NASA Langley Research Center135444042444450465247434346394346504448464647484945341NASA Langley Research Center
Tidewater Community College135464244434851435246434244414447504349444148445147311Tidewater Community College
VA Tech Agricultural Research Center132403941424851445147424142373942504344414645444945291VA Tech Agricultural Research Center
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
Aurora Hills Visitor Center138403942383848475442424240394345474247414145414650401Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory137434244444750495444454444404348514645464247485151381Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County136393941383946465241414240384244474346393845414554401Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area134393840413546455039424243384144474134423842454850381Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School140414143434044495643434343414546504542424246424749381Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows142424144485147505644444645424547504439444547515552411Shenandoah National Park - Big Meadows
Long Park - Haymarket139424144444046495643424344414648504438454246434851391Long Park - Haymarket
Widewater Elem. School - Widewater136424043404048475244444444414247504645453946454853401Widewater 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.