© 2024 KVPR | Valley Public Radio - White Ash Broadcasting, Inc. :: 89.3 Fresno / 89.1 Bakersfield
89.3 Fresno | 89.1 Bakersfield
Play Live Radio
Next Up:
0:00
0:00
0:00 0:00
Available On Air Stations

Valley Soil A Major Air Pollution Source, Says New Study

Ian Faloona, UC Davis
Researchers used a combination of computer models and airborne surveys to determine soil NOx emissions in California.

 

When you hear about air pollution, you may think of vehicle emissions, industrial smokestacks and wood burning. But a new study reveals another major source right below your feet in the Central Valley.

The pollutants in question are nitrogen oxides, a family of harmful gases known collectively as NOx. They’re precursors to ozone and particulate matter, which can lead to a litany of short and long-term health problems.

The study, published today in the journal Science Advances, asserts that one major source of NOx has been overlooked: The soil.

Using a combination of computer models and airborne surveys, lead author Maya Almaraz of UC Davis found soils could be a huge NOx contributor. "We show that soils account for 25-41% of the total NOx budget in the state," she says.

That puts soils in the same ballpark as vehicle emissions as NOx sources.

Almaraz says most soils contain microbes that process nitrogen and expel NOx. But those microbes pump out even more NOx where there’s heat and nitrogen-rich fertilizer—like in the Central Valley. "We sort of have this perfect storm," she says: "We have high nitrogen inputs on soils that are hot and dry, so we get these emissions and they stay in that valley."

Almaraz says it’s important to not blame agriculture, but to develop tools for applying fertilizer more efficiently.

Kerry Klein is an award-winning reporter whose coverage of public health, air pollution, drinking water access and wildfires in the San Joaquin Valley has been featured on NPR, KQED, Science Friday and Kaiser Health News. Her work has earned numerous regional Edward R. Murrow and Golden Mike Awards and has been recognized by the Association of Health Care Journalists and Society of Environmental Journalists. Her podcast Escape From Mammoth Pool was named a podcast “listeners couldn’t get enough of in 2021” by the radio aggregator NPR One.
Related Content