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Peak Daily One-Hour Ozone Averages for February 2019

The table below lists the peak daily one-hour ozone concentrations measured in February 2019 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 2019POCMonitoring Site
Rural Retreat13745484734192941403229414245404639371Rural Retreat
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
Albemarle High School13134434738291543403631294140444435341Albemarle High School
Frederick Co. Public School Maint. Dept.12934384331271637383631303939454235311Frederick Co. Public School Maint. Dept.
Natural Bridge Station128403250361115441836NANA4340464535331Natural Bridge Station
Harrisonburg VDOT1183943463330844383227234139484335311Harrisonburg VDOT
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School13039455135272643383730264444464634321Herman L. Horn Elementary School
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
Charles City County12528454643432749403632324341464133371Charles City County
Beach Road VDOT12335504845452850424033314546473932381Beach Road VDOT
MSIC (MathScience Innovation Center)12528424845432249403631304140444134351MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
NASA Langley Research Center13729474653433551404437394445474238401NASA Langley Research Center
Tidewater Community College14026433643463248403935324343484036381Tidewater Community College
VA Tech Agricultural Research Center14337454947483347354032324445494033401VA Tech Agricultural Research Center
AreaMonitoring SitePOCFebruary 2019POCMonitoring Site
Aurora Hills Visitor Center12324263932292138363631283739454334301Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory13132394741432747373930374141444337341Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County12827334639362539383731293838434236291Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area12233414740421841373832273841414035321Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School12530254036232239383832324140474435331Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows13943465050393144414441414347484641411Shenandoah National Park - Big Meadows
Long Park - Haymarket12731334337381741383832304041454335311Long Park - Haymarket
Widewater Elem. School - Widewater12729334636382545393932364139444538341Widewater 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.