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Map Monitoring Sites
Monitoring site information is available below in spreadsheet format (CSV) and keyhole markup language format (KML or KMZ) compatible with Google Earth™ and other software applications. If you would like to use Google Earth, you can access the Google Earth User Guide
for directions for downloading and installing.
These files contain air quality monitoring site information for the networks listed below. The monitoring site information comes from the AQS Data Mart. Links inside the files allow you to download annual and daily data directly from the AQS Data Mart one site at a time. These files display all monitors having any data since 1990. For more detailed information, read the complete documentation (PDF, 163 KB). These files are updated every Friday morning.
- Criteria Pollutant Networks
- CO (KMZ, 301 KB) (CSV, 7.0 MB)
- Lead (KMZ, 264 KB) (CSV, 4.8 MB)
- NO2 (KMZ, 281 KB) (CSV, 6.7 MB)
- Ozone (KMZ, 642 KB) (CSV, 16.1 MB)
- PM10 (KMZ, 915 KB) (CSV, 20.8 MB)
- PM2.5 (KMZ, 458 KB) (CSV, 11.4 MB)
- SO2 hourly (KMZ, 419 KB) (CSV, 9.1 MB)
- SO2 5-minute (monitors reporting twelve 5-minute values every hour) (KML, 70 KB)
- SO2 max 5-minute (monitors reporting the maximum of the twelve 5-minute values) (KML, 537 KB)
- Other Networks
- PM2.5 Chemical Speciation Network - "Trends Speciation" and "Supplemental Speciation" monitors only (KMZ, 69 KB) (CSV, 871 KB)
- IMPROVE - Interagency Monitoring of Protected Visual Environments (KMZ, 48 KB) (CSV, 826 KB)
- NATTS - National Air Toxics Trends Stations (KMZ, 6 KB) (CSV, 50 KB)
We are also posting a kml file that provides additional information for air toxics monitoring sites. This file allows you to see all monitors (in addition to NATTS) that measured any air toxics data during the period 2003 to 2005. When you click on the placemark, you can see descriptive site information and a list of all hazardous air pollutants (HAPs) measured at that site. HAPs are typically grouped into four categories which are distinguished by color in the kml file. Volatile organic compounds (VOCs) are purple, semivolatile organic compounds (SVOCs) are pink, carbonyl compounds are orange, and metals are blue.
- HAP sites by category (KMZ, 216 KB)
Note that some monitoring site coordinates may be based on a different projection system than Google Earth's, resulting in a slight visual shift (less than a mile) from the actual location. These files are provided by EPA and are not hosted on a Google Earth server. Users new to Google Earth will notice that there are "layers" of other standard information provided in the Google Earth software that are independent of these files. They provide the ability to overlay additional geographic information like roads, topography, and landmarks. Some of these layers may already be turned on when you open Google Earth. If not, you can turn them on simply by selecting the appropriate checkbox.