Monitoring Network Plan

2026 Annual Air Quality Monitoring Network Plan Workshop
A workshop will be held on May 22, 2026 to present and solicit comment on South Coast AQMD's Draft 2026 Annual Air Quality Monitoring Network Plan, federal requirements, and the PM 2.5 Continuous Monitor Comparability Assessment.

Workshop Details (PDF, 535kb)

Join Zoom Meeting at link below or by phone.
https://aqmd.zoomgov.com/j/1615701123

Meeting ID: 161 570 1123
Phone: (669) 216-1590

Background

The Annual Air Quality Monitoring Network Plan describes the network of ambient air quality monitors located within the South Coast AQMD's four-county jurisdiction [click here to view map (PDF, 455kb)].  The Plan includes a review of actions taken during the previous fiscal year, and outlines plans for action in the year ahead. 

Federal regulations require that the air quality monitoring network be reviewed annually to identify any need for additions, relocations, or terminations of monitoring sites or instrumentation.  After a 30-day comment period, the Plan is submitted to the U.S. Environmental Protection Agency (U.S. EPA) by July 1 of each year. 
 
Annual Air Quality Monitoring Network Plan

To view the latest Annual Air Quality Monitoring Network Plan, click on the appropriate link below:

• South Coast AQMD 2025 Annual Air Quality Monitoring Network Plan (PDF, 744kb)

• Appendix A "Network Depictions" (PDF,  1.77 MB)

• Appendix B "Detailed Site Information" (PDF, 120kb)

• Appendix C "PM2.5 Continuous Monitor Comparability Assessment and Request for Waiver" (PDF, 732kb)

• Appendix D "System Modification Requests" (PDF, 3.21 MB)

• Appendix E "Approved Waivers" (PDF, 760kb)

• Anaheim (PDF, 5.58 MB)

• Anaheim Near Road (PDF, 987kb)

• Banning Airport (PDF, 1.20 MB)

• Big Bear (PDF, 800kb)

• Central San Bernardino Mountains  (PDF, 935kb)

• Closet World Quemetco (PDF, 4.40 MB)

• Compton (PDF, 8.23 MB)

• Fontana (PDF, 748kb)

• Glendora (PDF, 1.36 MB)

• Indio Amistad HS  (PDF, 1.18 MB)

• La Habra (PDF, 5.75 MB)

• Lake Elsinore (PDF, 1.07 MB)

• Long Beach Hudson (PDF, 3.84 MB)

• Long Beach Route 710 Near Road  (PDF, 1.30 MB)

• Los Angeles (Main St.) (PDF, 1.81 MB)

• Mecca (Saul Martinez) (PDF, 830kb)

• Mira Loma (Van Buren) (PDF, 762kb)

• Mission Viejo (PDF, 640kb)

• North Hollywood (PDF, 1.07 MB)

• Ontario Etiwanda Near Road (PDF, 2.96 MB)

• Ontario Route 60 Near Road (PDF, 1.07 MB)

• Palm Springs (PDF, 1.01 MB)

• Pasadena (PDF, 4.71 MB)

• Pico Rivera (PDF, 1.22 MB)

• Pomona (PDF, 1.02 MB)

• Redlands (PDF, 3.25 MB)

• Rehrig (Exide) (PDF, 1.07 MB)

• Reseda (PDF, 1.14 MB)

• Rubidoux (PDF, 1.45 MB)

• San Bernardino (PDF, 901kb)

• Santa Clarita (PDF, 1.11 MB)

• Signall Hill (PDF, 1.23 MB)

• Temecula (PDF, 2.92 MB)

• West Los Angeles (PDF, 1.20 MB)

Five Year Air Monitoring Network Assessment

Background
A periodic network assessment of the South Coast AQMD ambient air monitoring network is required as a key tool to help ensure that criteria pollutants are measured in important locations and that monitoring resources are used in the most effective and efficient manner to meet the needs of multiple stakeholders.  Network assessments are required every five years at a minimum to determine if the network meets monitoring objectives defied in Title 40, Part 58 Appendix D of the code of Federal Regulations.

To view the July 1, 2025 Five Year Air Monitoring Network Assessment click on the appropriate link below:

2025 Five Year Air Monitoring Network Assessment (PDF, 1.63MB)
Appendix A Network Depictions (PDF, 3.05MB)
Appendix B PAMS Monitoring Network Plan (PDF, 651kb)

If you have comments or questions about the plan, contact Brandon Feenstra at bfeenstra@aqmd.gov, or 909-396-2193.