The annual data quality report describes the quality of the ambient air quality data in quantifiable terms in relation to measurement quality objectives established by U.S. Environmental Protection Agency. Tables included in the report provide summary data for ambient air monitoring stations in the statewide network within CARB’s PQAO, with comparisons to other PQAOs in California and the nationwide average, where appropriate.

Download the 2022 Annual Data Quality Report using the link below. For previous year's reports, please send a request to: qa@arb.ca.gov.

 Executive Summary

The Code of Federal Regulations (CFR) defines the California Air Resources Board (CARB) as one of seven Primary Quality Assurance Organizations (PQAO) in California responsible for monitoring air pollutants and assessing data quality. The purpose of this report is to provide ambient air quality data producers and users with a centralized review of the data quality within CARB’s PQAO with respect to criteria defined by measurement quality objectives (MQO). The specific MQOs reviewed in this report include:

• Data capture, which is the amount of ambient data reported.
• Precision, which is the degree of mutual agreement among individual measurements of the same property.
• Bias, which is the systematic or persistent distortion of a measurement process which causes error in one direction.
• The amount of precision and bias data collected and reported.

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Download the 2022 Annual Data Quality Report using the link below. For previous year's reports, please send a request to: qa@arb.ca.gov.