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Welcome To The TREX Network

The TREX now offers continuous ambient monitoring data from stations located in multiple states.

Select a region from the map below to retrieve a daily summary of hourly data collected at TREX's (and other select monitoring entities) continuous ambient monitoring stations. These monitoring stations continuously sample the atmosphere and create an average every five minutes for each parameter monitored. Hourly averages are then calculated from these five-minute averages.

Map showing regions with links to more detailed maps.
1 - CT-ME-MA-NH-RI-VT
2 - NJ-NY-PR-VI
4 - KY-TN-NC-SC-MS-AL-GA-FL
5 - MN-WI-IL-MI-IN-OH
6 - NM-TX-OK-AR-LA
8 - MT-ND-WY-SD-UT-CO
9 - CA-NV-AZ-HI-AS-GU
10 - WA-OR-ID-AK

Although this is the most current data, it is not considered official until it has been certified by the TREX (or other responsible entity) technical staff. Only data from monitoring entities that are partnered with the TREX is available via this web page. This information is updated hourly.

This web page provides the most current hourly averaged data available. Our convention for time-tagging data is the beginning of each hour. For example, values shown for the noon hour are based on measurements taken from noon to 1:00 p.m. The noon average will not be calculated until after 1:00 p.m. The noon average will then be available on our external server from 1:15 p.m. to 1:30 p.m. This results in an apparent one-hour time lag in the data. We also present our data in Local Standard Time for each measuring site. Most of the United States will switch between Daylight Savings and Standard Time twice each year. During Daylight Savings, this introduces another apparent one-hour time lag in the data.

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. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.