Local Wildfires and Air Quality Precautions

Local wildfires are impacting air quality conditions throughout the region, including on campus. The Air Quality Index (AQI) at the Institute can be monitored on our AQI site.

Smoke from wildfires contains many hazards and fine particles (PM2.5) that can harm health and cause reduced lung function, worsen asthma or other existing heart and lung conditions, and cause coughing, wheezing, and difficulty breathing. The smallest -and usually the most harmful -particulate matter is called PM2.5 because it has a diameter of 2.5 micrometers or smaller.

Ways to limit your exposure to wildfire smoke:

• Remain indoors with windows and doors closed or seek alternate shelter.
• Limit outdoor activity and avoid vigorous exercise.
• Keep windows and doors shut and make use of air purifiers indoors where possible.
• To clean surfaces of ash, DO NOT disturb the ash.
  1. Lightly spray surface with water to suppress dust, 2. Use pre-moistened cleaning wipes OR use damp cloth/paper towels to gently wipe surfaces, and 3. work from clean areas toward dirty areas.
• Watch the OSHA video on Voluntary use of N95's.
  • N95 masks are available during operating hours in the Caltech Bookstore.

When the current AQI (Air Quality Index) is greater than 151 for fine particles (PM2.5), consult with your Supervisor about ways to reduce exposure, such as:

• Relocation to enclosed buildings, structures, or vehicles where the air is filtered, or
• Voluntary use of an N95 respirator, per the Institute's Respiratory Protection Program.