Air Quality

View to the south from the top of Lassen Peak
View looking south from the top of Lassen Peak
Three stacked images of air quality monitoring stations, landscape photo with hazy sky, and infographic on wildfire smoke and health
Top to bottom: Manzanita Lake air quality montoring stations, Lake Helen and Lassen Peak in smoke, and infographic on Wildfire Smoke and Your Health

Air Quality Monitoring

Wildfire Smoke and Air Quality

The best indicator of air quality related to wildfire smoke is particle pollution level. This measurement is often displayed as: Particles (PM2.5). This represents the concentration of fine particles in the air that are 2.5 micrometers or smaller (these can only be seen with a microscope). There are currently no instruments in the park to take PM2.5 measurements.

View the particle pollution levels near the park via Chester, Redding, Red Bluff
View ozone levels only: Manzanita Lake Area | Mineral

Lassen Volcanic National Park is a Class I airshed, which receives the highest level of protection under the law. Lassen participates in four air quality monitoring networks (CASTNET, IMPROVE, NADP/NTN, GPMP). Park scientists visit air quality monitoring stations in the Manzanita Lake Area once a week to prepare rain or snow samples for the lab, change filters, and check the conditions of sensors. Learn more about air quality in the park here.

Smoke Impacts

View California Smoke Information or Fire-related Air Conditions

During summer, smoke from wildfires in and around Lassen occasionally degrade park air quality. Fires and related smoke impacts can continue to occur in the fall and sometimes as late as December in a dry year. The park and its features and facilities rarely close for smoke impacts alone. However, visitors are are encouraged to reduce time spent outdoors in smoky areas.

Smoke and Your Health

Learn more about Reducing Your Smoke Exposure, Wildfire Smoke and Your Health, and How to Protect Yourself from Wildfire Smoke (video)
When wildfires create smoky conditions, there are things you can do, indoors and out, to reduce your exposure to smoke. Reducing exposure is important for everyone’s health — especially children, older adults, and people with heart or lung disease.


Visibility is our ability to clearly see color and detail in distant views. Haze results from air pollutants, such as fine particles that absorb and scatter sunlight. Some haze occurs naturally due to dust, fog, and wildfire smoke. Unnatural haze is caused by air pollution from industry and motor vehicles. Visibility has improved at Lassen since monitoring began in the late 1980s. The clearest days have become clearer. In the last decade, the haziest days have become slightly less hazy. The estimated visual range on mid-range days was about 175 miles.

Lassen Volcanic Webcams

Kohm Yah-mah-nee Visitor Center Webcam (Southwest Area) | Manzanita Lake Webcam (Northwest Area)

Last updated: July 22, 2020

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Mailing Address:

PO Box 100
Mineral, CA 96063


(530) 595-4480

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