National crop loss assessment network: quality assurance program.

Area of Science:

• Environmental Science
• Agricultural Science
• Data Quality Management

Background:

• The National Crop Loss Assessment Network (NCLAN) program assesses economic impacts of air pollution on US agriculture.
• US Environmental Protection Agency (EPA) mandates known and documented data quality for environmental studies.
• A robust quality assurance (QA) program is essential for reliable agricultural economic impact assessments.

Purpose of the Study:

• To implement and evaluate a comprehensive quality assurance program within the NCLAN.
• To ensure environmental data collected were of known quality and suitable for intended use.
• To quantitatively assess data quality in terms of precision, accuracy, completeness, representativeness, and comparability.

Main Methods:

• Developed and implemented standardized research and monitoring protocols across NCLAN sites.
• Established a range of audit and review procedures, including independent on-site audits.
• Quantitatively measured data quality parameters such as precision and accuracy.

Main Results:

• Project data quality objectives proved valuable for validating data from diverse research sites.
• Standardized protocols successfully ensured data comparability across different research locations.
• On-site audits effectively evaluated adherence to established research protocols.
• Precision and accuracy measurements facilitated data quality assessment and instrument maintenance.

Conclusions:

• The QA program successfully enhanced the reliability and comparability of NCLAN data.
• Standardized protocols and audits are critical for maintaining data integrity in multi-site environmental studies.
• Data quality objectives and quantitative measurements are essential for ensuring data acceptability and guiding research improvements.