Science Inventory

NO2, CO, and SO2 Supplement to the 2021 Report on Performance Testing Protocols, Metrics, and Target Values for Ozone Air Sensors

Citation:

Duvall, R., A. Clements, K. Barkjohn, M. Kumar, D. Greene, T. Dye, V. Papapostolou, W. Mui, AND M. Kuang. NO2, CO, and SO2 Supplement to the 2021 Report on Performance Testing Protocols, Metrics, and Target Values for Ozone Air Sensors. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-23/146, 2024.

Impact/Purpose:

The use of air sensor technologies continues to grow for a variety of applications. However, there is still significant variability in sensor data quality from air sensors. Standard testing protocols to evaluate air sensors are needed to better understand sensor performance and to help user select sensors that are appropriately suited for a desired application. In 2021, the U.S. EPA developed a report outlining testing protocols, metrics, and target values to evaluate the performance of ozone (O3) air sensors for use in non-regulatory supplemental and informational monitoring applications. EPA is continuing these efforts by providing recommended testing protocols, metrics, and target values for NO2, CO, and SO2 air sensors. This work is important as it will provide a consistent approach for sensor performance evaluations, help increase confidence in data quality, help stimulate improvements and development in the marketplace, and help consumers choose sensors appropriate for applications of interest. Groups that would be interested or could apply the results from this work include state/local/tribal agencies, EPA Regional Offices, other Federal agencies and departments, international organizations, academia, sensor manufacturers/developers, sensor testing organizations, and the general public.

Description:

The use of air sensors continues to grow for a variety of air monitoring applications. However, the data quality still remains highly variable. In 2021, the U.S. EPA published reports outlining recommended testing protocols to evaluate the performance of ozone air sensors for non-regulatory supplemental and informational monitoring (NSIM) applications in ambient, outdoor, fixed site environments. These protocols also include recommended performance metrics and target values (testable performance metrics) to understand and compare sensor performance. EPA is continuing these efforts and providing recommended performance testing protocols, metrics, and target values for air sensors measuring nitrogen dioxide (NO2), carbon monoxide (CO), and sulfur dioxide (SO2). While these sensors are commercially available, fewer performance evaluations and successful field applications have been reported suggesting a need for further development. The report is helping advance understanding of NO2, CO, and SO2 sensor performance and helping guide future technology improvements.

URLs/Downloads:

NO2, CO, and SO2 Supplement to the 2021 Report on Performance Testing Protocols, Metrics, and Target Values for Ozone Air Sensors  (PDF, 2 pp,  10424  KB,  about PDF)

Appendix F_Reporting Template for NO2 Base Testing Protocol_Partially Accessible fillable

Appendix F_Reporting Template for NO2 Base Testing Protocol_Accessible non-fillable  (PDF, 3 pp,  618  KB,  about PDF)

Appendix F_Reporting Template for CO Base Testing Protocol _Partially accessible -fillable

Appendix F_Reporting Template for CO Base Testing Protocol_Accessible non-fillable  (PDF, 3 pp,  786  KB,  about PDF)

Appendix F_Reporting Template for SO2 Base Testing Protocol _Partially accessible-fillable

Appendix F_Reporting Template for SO2 Base Testing Protocol _Accessible non-fillable  (PDF, 3 pp,  656  KB,  about PDF)

Appendix H_Reporting Template for NO2 Enhanced Testing Protocol_Partially accessible-fillable

Appendix H_Reporting Template for NO2 Enhanced Testing Protocol_Accessible non-fillable  (PDF, 3 pp,  158  KB,  about PDF)

Appendix H_Reporting Template for CO Enhanced Testing Protocol_Partially accessible-fillable

Appendix H_Reporting Template for CO Enhanced Testing Protocol _Accessible non-fillable  (PDF, 3 pp,  152  KB,  about PDF)

Appendix H_Reporting Template for SO2 Enhanced Testing Protocol_Partially accessible-fillable

Appendix H Reporting Template for SO2 Enhanced Testing Protocol_Accessible non-fillable  (PDF, 3 pp,  154  KB,  about PDF)

Record Details:

Record Type:DOCUMENT( PUBLISHED REPORT/ REPORT)
Product Published Date:02/16/2024
Record Last Revised:02/28/2024
OMB Category:Other
Record ID: 360578