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Peak Daily One-Hour Ozone Averages for March 2017

The table below lists the peak daily one-hour ozone concentrations measured in March 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 SitePOCMarch 2017POCMonitoring Site
12345678910111213141516171819202122232425
Southwest
Rural Retreat1424544475450475155474547464242484249384451535456481Rural Retreat
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
12345678910111213141516171819202122232425
Valley
Albemarle High School13845414645424951564545NA454245495145424246485255531Albemarle High School
Frederick Co. Public School Maint. Dept.1414341424535354955434342464146464949394542464949511Frederick Co. Public School Maint. Dept.
Natural Bridge Station1434542474540475155474648464445484848414346515156541Natural Bridge Station
Harrisonburg VDOT1414442444840425056454646484346494647424044464955541Harrisonburg VDOT
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
12345678910111213141516171819202122232425
Blue Ridge
Herman L. Horn Elementary School1414543464747475153464647474244474847394647505153491Herman L. Horn Elementary School
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
12345678910111213141516171819202122232425
Piedmont
Charles City County1384543464548504956444746434245485247494347475053461Charles City County
Beach Road VDOT1404543464654545256454848434346495747474446484854501Beach Road VDOT
Hanover1374442454450535055444746444145485348494741465054521Hanover
MSIC (MathScience Innovation Center)1374442464549534852444747454143475346494544474852501MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
12345678910111213141516171819202122232425
Tidewater
NASA Langley Research Center1384641454550534955504546474245485347525049485051471NASA Langley Research Center
Tidewater Community College1384844464551534756494646454446495345524748494753491Tidewater Community College
VA Tech Agricultural Research Center1364241444451534753494545444041455146484553474851491VA Tech Agricultural Research Center
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
12345678910111213141516171819202122232425
Northern
Aurora Hills Visitor Center1394342443941514959434445444146484948524545484450601Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1374545464750515157464747484244505447494947495054531Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1374241434041484857424344434044474949514244484349581Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area1344041414438484753424345474143465045374442454750521Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School1404343454646495159454545474348495350444545494450541Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1424443454753495257534548484546485146424647485156541Shenandoah National Park - Big Meadows
Long Park - Haymarket1414544464643505160454546484448505349424844484750561Long Park - Haymarket
Widewater Elem. School - Widewater1374343454244504955464646464244495250484845494650581Widewater 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.