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Peak Daily One-Hour Ozone Averages for February 2018

The table below lists the peak daily one-hour ozone concentrations measured in February 2018 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 SitePOCFebruary 2018POCMonitoring Site
Rural Retreat1394040403525293644372927392328403240391Rural Retreat
AreaMonitoring SitePOCFebruary 2018POCMonitoring Site
Albemarle High School1363737314132254138232135362324403438311Albemarle High School
Frederick Co. Public School Maint. Dept.1343336323725334236101041423026363536361Frederick Co. Public School Maint. Dept.
Natural Bridge Station1403736353931283939331732362627393240291Natural Bridge Station
Harrisonburg VDOT1383636333929254438322240393029393239341Harrisonburg VDOT
AreaMonitoring SitePOCFebruary 2018POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School1413837354030283840292130412726433441321Herman L. Horn Elementary School
AreaMonitoring SitePOCFebruary 2018POCMonitoring Site
Charles City County1453834373829233842242230373125333537311Charles City County
Beach Road VDOT1443737323631294043302329343026323338291Beach Road VDOT
MSIC (MathScience Innovation Center)1413635303833254038182231383023343539291MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCFebruary 2018POCMonitoring Site
NASA Langley Research Center1444436404034404144332531383724334138371NASA Langley Research Center
Tidewater Community College1444332414034414042362633393525353637321Tidewater Community College
VA Tech Agricultural Research Center1474638434240444245352635373527333939371VA Tech Agricultural Research Center
AreaMonitoring SitePOCFebruary 2018POCMonitoring Site
Aurora Hills Visitor Center1323334303827324139342037362726383637311Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1403535283729324237322336403026373639281Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1343435303828314138341938403025373737301Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area1373336343929294238332538362926343639321Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School1353536323929354132252243372528393637281Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1413740424137404342433342463928403740381Shenandoah National Park - Big Meadows
Long Park - Haymarket1363536323829334132232143372828413638311Long Park - Haymarket
Widewater Elem. School - Widewater1363435293929334234292338392925393738281Widewater Elem. School - Widewater

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.