1. Guidance for Reporting of Daily Air Quality—Air Quality Index (AQI);EPA-454/R-99-010; U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards: Research Triangle Park, NC, 1999.
2. Guidance for the Data Quality Objectives Process;EPA QA/G-4; U.S. Environmental Protection Agency, Quality Assurance Management Staff: Washington, DC, 1994.
3. 40 CFR Part 58 (62 FR 38763, July 18, 1997).
4. 40 CFR Part 50 (62 FR 38651, July 18, 1997).
5. Quality Assurance Report, Calendar Year 1999, The PM25Ambient Air Monitoring Program;EPA-454/R-00-041; U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards: Research Triangle Park, NC, 2000.