Clean Truck Check in Santa Maria, CA

Air quality context in and around Santa Maria

Annual aggregate readings from EPA Air Quality System monitors within about 25 miles of Santa Maria, reporting year 2025. Clean Truck Check exists to reduce real-world emissions from heavy-duty vehicles — the numbers below are the local baseline those rules are designed to improve.

PM2.5

5.39 Micrograms/cubic meter (LC)

6 monitors · 68,850 observations · 36 days above standard

Nitrogen dioxide (NO₂)

2.34 Parts per billion

3 monitors · 47,978 observations · 0 days above standard

Ozone (O₃)

0.04 Parts per million

7 monitors · 213,610 observations · 8 days above standard

Source: EPA Air Quality System (AQS) API. Reporting year 2025. Last fetched 2026-05-18.