Data available on this site consists of both “raw” data and data has that been subjected to rigorous quality assurance and quality control (QA/QC) processes depending on the date(s) of interest. Raw data must undergo QA/QC processing before it can be considered valid.

In order to provide the public with timely information, the most recent data currently available on this web site is raw data. Depending on the date, the data available from previous months will have undergone QA/QC processing. The majority of the time the raw data differs only slightly from data that has undergone QA/QC processing. Some of the time, however, there may be significant differences.

PAMZ continuous and passive data is also available through the CASA Data Warehouse where it can be freely downloaded. PAMZ Intermittent Data (Particulate Matter) is currently only available through the CASA Data Warehouse.

Due to size constraints this website only maintains continuous data for two years and passive data for one year. Data prior to these dates can be accessed through the CASA Data Warehouse.