In July 1997, the U. S. Environmental Protection Agency (EPA) announced a new National Ambient Air Quality Standard for ground-level ozone. The EPA is phasing out and replacing the previous one-hour standard with a new eight-hour standard to protect public health against longer exposure to the air pollutant.
A community will meet the new standard when the three-year average of the fourth-highest daily maximum eight-hour concentration measured at each monitoring site is less than 85 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. All times shown are in 24-hour format and are Local Standard Time. These times correspond to the beginning of the hourly average.
| 2013 -- Sorted by Maximum Value |
|---|
| Location | Region | CAMS | AQS | Date | Time | Value | POC | Hours
Exceeded |
|---|
| Saint Regis Mohawk Tribe-NY | 02 | 1035 | 36_033_7003 | April 10 2013 | 13:00 | 403 | 1 | 2 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | May 29 2013 | 10:00 | 347 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | April 1 2013 | 06:00 | 339 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | May 1 2013 | 06:00 | 335 | 1 | 1 |
| Saint Regis Mohawk Tribe-NY | 02 | 1035 | 36_033_7003 | June 6 2013 | 13:00 | 249 | 1 | 1 |
| Saint Regis Mohawk Tribe-NY | 02 | 1035 | 36_033_7003 | April 24 2013 | 12:00 | 248 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | March 10 2013 | 05:00 | 232 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | May 5 2013 | 05:00 | 232 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | May 12 2013 | 05:00 | 229 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | April 7 2013 | 05:00 | 225 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | May 26 2013 | 05:00 | 223 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | May 19 2013 | 05:00 | 221 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | March 31 2013 | 05:00 | 220 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | April 21 2013 | 05:00 | 220 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | April 28 2013 | 05:00 | 220 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | March 24 2013 | 05:00 | 194 | 1 | 1 |
| Saint Regis Mohawk Tribe-NY | 02 | 1035 | 36_033_7003 | May 8 2013 | 12:00 | 192 | 1 | 2 |
| Saint Regis Mohawk Tribe-NY | 02 | 1035 | 36_033_7003 | May 22 2013 | 13:00 | 186 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | April 14 2013 | 05:00 | 185 | 1 | 1 |
| Saint Regis Mohawk Tribe-NY | 02 | 1035 | 36_033_7003 | May 20 2013 | 14:00 | 180 | 1 | 1 |
| Saint Regis Mohawk Tribe-NY | 02 | 1035 | 36_033_7003 | June 4 2013 | 08:00 | 146 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | May 31 2013 | 06:00 | 145 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | June 9 2013 | 05:00 | 142 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | June 16 2013 | 05:00 | 139 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | June 2 2013 | 05:00 | 138 | 1 | 1 |
| Penobscot Indian Nation-ME | 01 | 1100 | 23_019_1100 | January 27 2013 | 05:00 | 126 | 1 | 1 |
| POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site. |
PLEASE NOTE: This data has not been verified by the TREX 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 TREX ambient monitoring sites and may include data collected by other outside agencies.
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.
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