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Daily Maximum Eight-Hour Ozone Averages for February 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in February 2019 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 SitePOCFebruary 2019POCMonitoring Site
Rural Retreat1354140433021343736302535404337423634251Rural Retreat
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
Albemarle High School1272840383425124038352326403742383332251Albemarle High School
Frederick Co. Public School Maint. Dept.1252728352722113335332326362440383333361Frederick Co. Public School Maint. Dept.
Natural Bridge Station1203326423151037133400NV3943393331231Natural Bridge Station
Harrisonburg VDOT1153334352920184035311423403543373230251Harrisonburg VDOT
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School1253241443318314037352126424044413331251Herman L. Horn Elementary School
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
Charles City County1222437403536214438343027403743393134281Charles City County
Beach Road VDOT1182844394040224638382925424244373036241Beach Road VDOT
MSIC (MathScience Innovation Center)1222437433937214137342924393640383132321MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
NASA Langley Research Center1312840434140264439423537424245403635351NASA Langley Research Center
Tidewater Community College1332335322843NV4338363330404044383333331Tidewater Community College
VA Tech Agricultural Research Center138344046444629437373127414246383036301VA Tech Agricultural Research Center
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
Aurora Hills Visitor Center1202019212320183434342224353441383233361Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1292836453837234236362934393642403531361Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1242326393130203634352627363440383433351Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area12030384237351538353626NV363739363328321Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School1212619303118NV3735362328383143413335371Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows13743454943363142394238NVNV4545423937341Shenandoah National Park - Big Meadows
Long Park - Haymarket1222726363333153735362926382941393234381Long Park - Haymarket
Widewater Elem. School - Widewater1262427373035214136373033383841413631371Widewater 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).

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.