Eight-Hour Ozone High Value Days for 2009

The table below lists the daily maximum eight-hour ozone concentrations measured which exceed 75 parts per billion in 2009 in each community where TREX measures ozone. This information is updated hourly. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) Times shown are in 24-hour format and are Local Standard Time. Our convention is that the time reflects the beginning of the eight-hour average. All ozone measurements are in parts per billion.

Use the selection boxes below to customize this report. You may select a different year, a different sorting order, or a different report format. Click on the Generate Report button once you have made your selections.

YearSort ByReport Format
Highlight with AQI colors
2009 Sorted by Maximum Value
LocationRegionCAMSAQSDateTimeValuePOC
Penobscot Indian Nation-ME01110023_019_1100November 19 200902:003531 N
Penobscot Indian Nation-ME01110023_019_1100November 18 200923:002361 N
Saint Regis Mohawk Tribe-NY02103536_033_7003August 30 200918:001871
Saint Regis Mohawk Tribe-NY02103536_033_7003August 31 200902:001791
Penobscot Indian Nation-ME01110023_019_1100September 24 200907:001641 N
Saint Regis Mohawk Tribe-NY02103536_033_7003May 19 200912:001351
Saint Regis Mohawk Tribe-NY02103536_033_7003May 20 200913:001221
Saint Regis Mohawk Tribe-NY02103536_033_7003July 13 200909:001171
Saint Regis Mohawk Tribe-NY02103536_033_7003May 21 200911:001101
Saint Regis Mohawk Tribe-NY02103536_033_7003May 26 200910:00981
Saint Regis Mohawk Tribe-NY02103536_033_7003July 24 200909:00831
Saint Regis Mohawk Tribe-NY02103536_033_7003August 29 200923:00831
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

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 EPAExit.

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		 8hr Carbon Monoxide
in ppm		 24hr Sulfur Dioxide
in ppm		 24hr PM-10
in ug/m3		 24hr PM-2.5
in ug/m3
0 - 50 Not Defined 0 - 0.059 0 - 4.4 0 - 0.034 0 - 54 0 - 15.4
51 - 100 Not Defined 0.06 - 0.075 4.5 - 9.4 0.035 - 0.144 55 - 154 15.5 - 40.4
101 - 150 0.125 - 0.164 0.076 - 0.095 9.5 - 12.4 0.145 - 0.224 155 - 254 40.5 - 65.4
151 - 200 0.165 - 0.204 0.096 - 0.115 12.5 - 15.4 0.225 - 0.304 255 - 354 65.5 - 150.4
201 - 300 0.205 - 0.404 0.116 - 0.374 15.5 - 30.4 0.305 - 0.604 355 - 424 150.5 - 250.4
301 - 400 0.405 - 0.504 Not Defined 30.5 - 40.4 0.605 - 0.804 425 - 504 250.5 - 350.4
401 - 500 0.505 - 0.604 Not Defined 40.5 - 50.4 0.805 - 1.004 505 - 604 350.5 - 500.4
500 Not Defined Not Defined Not Defined Not Defined 605 - 4999 500.5 - 999.9
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