Four Highest Eight-Hour Ozone Concentrations in 2009
Use this form to retrieve the four highest eight-hour ozone concentration averages from data collected at TREX monitoring sites beginning December 14, 2005 through today. Although this is our most current data, it is not considered official until it has been certified by our technical staff. This information is updated hourly. All times shown are in Local Standard Time.The table below lists the four highest daily maximum eight-hour ozone concentrations measured in 2009 in each community where the TREX 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.) The fourth-highest average is in bold black (unless it is highlighted). All ozone measurements are in parts per billion. Times are shown in 24-hour format and correspond to the beginning of the eight hour average.
Use the selection boxes below to customize this report. You may select a different year or a different report format. If you want to cut and paste data from this web page into another application, such as a spreadsheet, select the comma-delimited format. Click on the Generate Report button once you have made your selections.
| Area | Monitoring Site | POC | Highest | Second Highest | Third Highest | Fourth Highest |
|---|
| Date | Time | Value | Date | Time | Value | Date | Time | Value | Date | Time | Value |
|---|
| CT-ME-MA-NH-RI-VT |
| Penobscot Indian Nation-ME | 1 N | 11/19/2009 | 0200 | 353 | 11/18/2009 | 2300 | 236 | 09/24/2009 | 0700 | 164 | 07/30/2009 | 0800 | 63 |
| Sipayik TAQP-ME | 1 | 05/21/2009 | 1400 | 74 | 05/22/2009 | 0500 | 63 | 04/25/2009 | 1000 | 56 | 04/20/2009 | 1000 | 54 |
| NJ-NY-PR-VI |
| Saint Regis Mohawk Tribe-NY | 1 | 08/30/2009 | 1800 | 187 | 08/31/2009 | 0200 | 179 | 05/19/2009 | 1200 | 135 | 05/20/2009 | 1300 | 122 |
| CA-NV-AZ-HI-AS-GU |
| Fort McDowell Yuma Frank-AZ | 1 N | 04/30/2009 | 1100 | 73 | 05/07/2009 | 1100 | 71 | 05/19/2009 | 1100 | 70 | 05/29/2009 | 1100 | 68 |
| Bishop Paiute Tribe-CA | 1 N | 04/29/2009 | 1100 | 69 | 08/02/2009 | 0900 | 64 | 08/13/2009 | 0800 | 63 | 08/12/2009 | 0900 | 63 |
| 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
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
.
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 |
Comments regarding Monitoring Operations: webmaster@ipsmtx.com
