Horizons Data Access
Welcome to the Horizons data access system. Due to the flexible storage method of all accumulated data, we are able to present many options for analyzing it. Please note that some functions require large amounts of data processing, so it may take a while for the resultant page to load.
All the data available on this site is raw data collected directly from the instruments in the field. These data have not gone through data validation or quality assurance. The calibration schedule for the instruments are listed in the site table.
Publications using Horizons data are requested to include an acknowledgement of, and citation to, to Portland State University.
The following is recommended:
Citation:
George, L.A., Parra, J. and Sitbon, P., 2005. Horizons - Portland Area Real-Time and Archived Air Quality and Meteorological Data. Data access via Portland State University Server Website (http://www.nextgen.pdx.edu). Portland State University - Center for Environmental Atmospheric Research (CEAR), Portland, OR.
Current Data
This provides a real-time image with the most current data of all locations currently transmitting data. The values are averaged over the past two hours, and the minimum and maximum values on the meters are indicated by the small tick marks on the left side. The wind meter displays the most recent reading, with the dark stripe indicating the 2-hour average and the light stripe indicationg the 2-hour minimum and maximum.
Graphing
Here, you can analyze specific data over any interval with the option to average over normalized time spans for better comparison between sites. There is no limit on time span (i.e. the number of data points) so some graphs will take longer to generate that others.
