What is the EPA's role in setting standards and QA/QC requirements for Colorado's air monitoring program?

• A. Directly operates all Colorado monitoring networks; sets all local budgets.
• B. Only responsible for funding; no standards.
• C. Creates weather data for modeling only.
• D. Establishes NAAQS, approves methods (FRM/FEM), sets QA/QC expectations, and provides guidance for data quality; states implement and operate networks.

Answer: (D)

The main idea is that EPA sets the national standards and the quality framework, while Colorado runs the actual monitoring programs under state oversight. EPA establishes the National Ambient Air Quality Standards (NAAQS) for pollutants like ozone and PM2.5, and it approves the methods used to measure those pollutants—Federal Reference Methods (FRM) and Federal Equivalent Methods (FEM). EPA also sets QA/QC expectations and provides guidance on data quality to ensure measurements are consistent and reliable across states and over time. Colorado then implements and operates its monitoring networks, following those EPA standards and the state’s SIP (state implementation plan) requirements, with EPA oversight and support as needed. The other options describe roles (operating networks, funding only, or just weather data) that don’t capture EPA’s role in setting standards, approving methods, and guiding data quality.