Operation Healthy Air

Check out the latest field report from Operation Healthy Air! We have detailed the first round of findings from our analysis of the data.

Operation Healthy Air 2017 Pilot Study Areas
Operation Healthy Air 2017 Pilot Study Areas


Operation Healthy Air seeks to increase our understanding of the role of vegetation, such as trees, in decreasing air temperature and improving air quality at scales that communities make decisions. In this case, the cooling of local neighborhoods and reducing ozone formation. Operation Healthy Air engaged partners and participants to map and measure how differences in their environment–such as the number of trees or amount of pavement–affect local air quality and temperature.

We initiated pilot “campaigns” in Long Beach, and along the Inland Empire in the summer of 2017, and expanded in 2018 to greater Los Angeles and other cities. Funding for this program comes from grants from NASA’s Earth Sciences program and the National Science Foundation, as well as individual donors.

Operation Healthy Air is a partnership between national and local partners, community-based organizations, universities, schools, aquaria, government agencies, and community members. The research is led by Dr. Darrel Jenerette and his lab at University of California Riverside, Dr. Jun Wang and his lab at the University of Iowa as well as Mark Chandler at Earthwatch Institute.


Operation Healthy Air engaged 200 community members and 750 students from Long Beach, Claremont, Ontario, San Bernardino and Riverside among other communities. These community participants together with 25 local partners helped deploy over 250 temperature sensors and 18 ozone sensors and map over 60 acres of local habitat.

You can now explore the results from the Operation Healthy Air community science project. We’ve created a website where you can explore the air temperature data from our study including the sensors placed by community participants. The website was developed by Dr. Lorena Castro who is part of the research team at University of Iowa led by Dr. Jun Wang. Through this website, you will be able to compare the air temperature from up to six different sensors as well as against a high-resolution air temperature forecast model. You can compare backyards to front yards, streets to city parks or schools, nighttime to daytime, as well as data across days. Check out our “How To Use ESMC iButton Data Explorer” blog for tips on how to use the tool.

What is Healthy Air?

Two of the greatest threats to human well-being in urban environments are the dramatic increase in extreme heat days (i.e., days above 105℉) and exposure to air pollutants including particulates and ozone. These pollutants can present severe health risks especially to those with respiratory illnesses such as asthma.

Currently, public announcements notify people of extreme (heat, smog, etc.) days with general health recommendations such as remaining indoors or seeking cool shelters– but this information is often very general and not specific to make daily decisions. These general numbers do not reflect local variation in air temperature or pollution – for example from house to house or neighborhood to neighborhood. The feeling that the numbers do not apply to “my circumstances” leaves community members uncertain how to respond. Making the right decision is important, especially when considering the need to protect some of our most vulnerable communities (e.g., children, elderly, economically disadvantaged, health challenged).

The Operation Healthy Air program developed a local community network of air sensors (temperature and humidity, and ozone sensors). Community members will mapped the local habitats around each sensor to test how different amounts of “green” (e.g., trees), “blue” (e.g., rivers, pools), and “grey” (e.g., buildings and pavement) environments influence local air quality. The local community networks is being integrated with other (e.g., research and government) networks of air sensors to develop a more comprehensive picture of regional variation in air quality.

How can citizen scientists help
How can community scientists help

What Do We Hope to Achieve?

Creating healthy and resilient urban environments for all including vulnerable communities is a high priority in cities globally. The creation and maintenance of green spaces in urban environments is seen as one of the most promising ways of creating a healthy city–for people and nature. There are many known benefits of trees, bushes, and other plants, including increased cooling, better human health (e.g., through increased physical activity) and higher property values. But people are often skeptical about investing in green space, whether it be their backyards, their streets, or parks because trees require resources (e.g., water), and their pollen, fruit, and leaves can be problematic. By improving our collective understanding of the benefits of trees in urban environments, we hope to increase our confidence in which trees to plant and where they will have the greatest influence in building healthy urban environments.

Programs in 2017

Operation Healthy Air 2017 Pilot Study Areas (view a larger PDF version of our OHA Participant map.)

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