City Smog by Pixabay

Chemical Speciation Network

CSN is the Chemical Speciation Network for the EPA. It is a PM2.5 sampling network with sites located principally in urban areas. The AQRC manages the data produced from CSN. The data first goes through a data ingest process that is completed by AQRC data management staff who have advanced training in database programming and database management.  Then an AQRC data analyst will process the sampling and analytical data. The data analyst will use functions in our custom software package to calculate final results and post them to the CSN database. This same analyst will also review output messages for errors. From there the data analyst will perform Level 1 validation on a set of CSN data. 

The delivery of the resultant data from the CSN is completed by the AQRC data analyst. The analyst will prepare delivery files of the validated CSN data sets using custom tools in the custom software package, datavalCSN. The collected results from the previous steps in the data generation and validation processes are formatted for delivery to DART. After a validation period, revisions are returned to the AQRC. The analyst ingests the file, addresses comments and reformats the dataset into AQS format to be submitted to the EPA's AQS database.