NASA's FarmFlux mission is flying a King Air research plane near Amarillo from Oct. 22 to Nov. 9. Here's why it circles farms, how low it may go, and what it measures.

If you have spotted a twin-engine plane making slow, low circles over farmland near Amarillo this week, it is almost certainly NASA — not a crop duster or a search plane. The agency said a research aircraft will fly low-altitude flights over farmland near Amarillo, Texas, from Thursday, Oct. 22, through Monday, Nov. 9, to measure gases and particles rising from animal feeding operations, according to a NASA announcement.

The plane is part of FarmFlux, a NASA mission studying how emissions from U.S. agriculture affect air quality, climate and ecosystems. It carries more than a dozen sensors to measure ozone, methane, ammonia, particulates and other pollutants from croplands and livestock farms, and how those substances interact with the atmosphere.

For Panhandle residents, ranchers and feedlot workers, the practical point is simple. This is a scheduled research flight, not an emergency or a law enforcement aircraft — and NASA expects it to keep flying for about two and a half weeks.

A Twin-Engine King Air Flying Circles Around Farms

The aircraft is a Dynamic Aviation A200, a two-engine King Air turboprop, NASA said. The same plane flew similar low-altitude flights over farmland near Greeley, Colorado, earlier in October, according to a separate NASA notice.

NASA's announcements do not give a specific altitude, but the mission's planning white paper describes the small aircraft flying as low as 500 feet above the ground on typical four-hour flights. Near a feeding operation, the plan calls for circles at about 1,000 and 500 feet to find obstacles and the direction of the plume, followed by stacked passes downwind.

The plan also tries to limit disturbance. "The aircraft remains 3000' from the edge of each facility to limit animal noise exposure," the white paper states, and the plane will frequently return to re-circle each site to track how emissions change through the day. Actual flight patterns may differ from the planning document depending on weather and air traffic.

Ammonia, Methane and Ozone Over Cattle Country

The Texas Panhandle is one of the country's major cattle-feeding regions, which makes it a natural place to measure what livestock operations release. According to the FarmFlux white paper, crops and livestock are the largest U.S. sources of ammonia, nitrous oxide, and methane, and digestion in cattle and other ruminants produces about 27% of total U.S. methane.

Those gases matter beyond climate. Ammonia helps form fine particles, known as PM2.5, that can be inhaled deep into the lungs. The white paper cites studies attributing 15,000 to 29,000 U.S. deaths a year to agricultural air pollution, mostly through fine particles, and estimating that ozone cuts corn and soybean yields by 5 to 10%.

The scientists say current measurements fall short. "Fundamentally, existing observations at the agriculture — atmosphere interface are insufficient to quantitatively test and improve model processes," the white paper states. NASA's Colorado notice called agricultural emissions "an important and understudied part of Earth's land and atmosphere systems."

Evidence check: the death and crop-loss estimates come from earlier modeling studies cited in the mission's planning document, not from FarmFlux itself. The flights are designed to replace estimates with direct measurements, and results will take months or longer to analyze.

Research Flights, Not Enforcement

FarmFlux is led by NASA's Goddard Space Flight Center in Greenbelt, Maryland, with Colorado State University and Boston University. Principal investigator Glenn Wolfe of NASA Goddard leads the mission, with deputy principal investigators Emily Fischer of Colorado State and Jeffrey Geddes of Boston University, according to NASA's FarmFlux project page.

It is a $15 million Earth Venture Suborbital investigation selected in 2024, according to Boston University. NASA says the data will feed air quality models used to forecast near-term air quality and test long-term strategies, and to make satellite measurements more useful over farm regions.

Nothing in NASA's announcements describes regulatory inspections or penalties. NASA is a research agency, and the stated goal is to understand how emissions vary with farm practices and weather. Producers who want to know how the data will be used can contact the mission team through its public pages.

Seeing the Plane and Asking Questions

People most likely to notice the flights are rural residents, ranch and feedlot workers, and drivers on Panhandle highways. Livestock owners may notice engine noise, although the mission plan keeps the aircraft about 3,000 feet from the edge of each facility.

If you see the plane, there is no need to call emergency services unless it appears to be in distress. Low, repeated circling is part of the sampling design. Questions about the mission can be directed through NASA's FarmFlux mission page, which lists its research goals.

Do not fly drones near the aircraft's flight area. Any drone near a low-flying plane creates a collision risk for the crew.

What happens next: the Amarillo flights end Nov. 9. A larger NASA P-3 Orion will fly over cropland in the Midwest and California's Central Valley from March to July 2027, and the King Air is expected to sample other farm regions as well. The mission's white paper lists planned small-aircraft bases in Bakersfield, California; Twin Falls, Idaho; and Des Moines, Iowa, in addition to Amarillo and Greeley. The bottom line is that the low plane over Panhandle farmland is a NASA science flight, and its measurements could shape how air quality forecasts treat farm country for years.

What Readers Want to Know

What is the low-flying plane near Amarillo?

It is a NASA Dynamic Aviation A200 twin-engine research aircraft flying for the FarmFlux mission.

How long will the flights last?

NASA said the flights run from Thursday, Oct. 22, through Monday, Nov. 9.

How low will it fly?

NASA has not given a specific altitude. The mission plan describes flights as low as 500 feet above ground near sampling sites.

What is it measuring?

Ozone, methane, ammonia, particulates, and other pollutants rising from livestock operations and farmland.

Is this regulatory enforcement?

NASA describes FarmFlux as a research mission. Its announcements do not mention inspections or penalties.

Will the plane disturb livestock?

The mission plan keeps the aircraft about 3,000 feet from the edge of each facility to limit noise exposure to animals.