The City of Sierra Madre lies within the western portion of the South Coast Air Basin (SoCAB), which includes all of Orange County and the non-desert portions of Los Angeles, Riverside, and San Bernardino Counties. The SoCAB is in a coastal plain with connecting broad valleys and low hills and is bounded by the Pacific Ocean in the southwest quadrant, with high mountains forming the remainder of the perimeter. The general region lies in the semi permanent high-pressure zone of the eastern Pacific. As a result, the climate is mild, tempered by cool sea breezes. This usually mild weather pattern is interrupted infrequently by periods of extremely hot weather, winter storms, and Santa Ana winds (SCAQMD 2005).

Air Quality Index

Wood smoke contains toxins that can be very detrimental to many people with sensitive respiratory systems.  It is very important to the health and wellbeing of Sierra Madre residents and visitors to follow air quality restrictions by visiting the "Check Before you Burn" link below, where you can also sign up to receive automatic alerts.

Check Before you Burn