Currently, AirNow supports two file formats:
AQCSV file (Preferred)
The AQCSV file is the preferred method of data transfer between AirNow and other data management systems.
For more information regarding how to format your data, click here.
OBS file (Discouraged method)
Information regarding Legacy OBS formatted files can be found here. An example of the data format is also available. Currently, this format is not the preferred method, as OBS formats have no native support for different Parameters of Occurence (POCs), mobile monitors, international data exchange, or three-dimensional data. It is also more difficult to process than the AQCSV format.