Urban Area Code


A code representing the urbanized area within which the monitoring site is located. An urbanized area is a U.S. Census Bureau demographic entity that comprises a place and the adjacent densely-settled surrounding territory that together have a minimum population of 50,000 people.

This field is automatically derived from the US Census geospatial database from the user-provided Latitude and Longitude. If it is provided by the user, it will be compared to the derived value, and a warning will be issued if the values do not match, but the transaction will be processed without error. (The derived value will be stored in the database and the reported value discarded.)

If the monitoring site is not within an urbanized area, then leave this field blank or use code 0000.

Business Rules

Must be a valid Urbanized Area Code.

Allowable values: https://aqs.epa.gov/aqsweb/documents/codetables/uars.html