![Noah Berger Tanks stand at California Dairies Inc. on Monday, May 20, 2024, in Pixley, Calif. Industrial-scale dairy farms already are among the biggest polluters in the San Joaquin Valley, a premier U.S. agricultural region with poor air quality. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/fc94ade276484047adffb81f08678a9b/preview/preview.jpg?s=680x)
Tanks stand at California Dairies Inc. on Monday, May 20, 2024, in Pixley, Calif. Industrial-scale dairy farms already are among the biggest polluters in the San Joaquin Valley, a premier U.S. agricultural region with poor air quality. (AP Photo/Noah Berger)
![Noah Berger Cows stand in a corral behind a digester at Van Beek Brothers Dairy on Monday, May 20, 2024, in Tipton, Calif, Dairy digesters capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/0344205fa2614f16ba2fee8e0828c6cc/preview/preview.jpg?s=680x)
Cows stand in a corral behind a digester at Van Beek Brothers Dairy on Monday, May 20, 2024, in Tipton, Calif, Dairy digesters capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)
![Noah Berger A worker milks cows at Wickstrom Jersey Farms on Thursday, May 9, 2024, in Hilmar, Calif. The farm uses a diary digester to capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/9bed72b6aa6c4bae836f218892227c4c/preview/preview.jpg?s=680x)
A worker milks cows at Wickstrom Jersey Farms on Thursday, May 9, 2024, in Hilmar, Calif. The farm uses a diary digester to capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)
![Noah Berger Robbie Macias, Aemetis vice president of biogas, gestures while demonstrating the strength of a dairy digester with Wickstrom Jersey Farms manager Brent Wickstrom on Thursday, May 9, 2024, in Hilmar, Calif. The digester captures methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/c284c484d6f649a2a6606bca08d1de03/preview/preview.jpg?s=680x)
Robbie Macias, Aemetis vice president of biogas, gestures while demonstrating the strength of a dairy digester with Wickstrom Jersey Farms manager Brent Wickstrom on Thursday, May 9, 2024, in Hilmar, Calif. The digester captures methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)
![Noah Berger Jersey cows stand in a stall at Wickstrom Jersey Farms on Thursday, May 9, 2024, in Hilmar, Calif. The farm uses a diary digester to capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/fee450a3f9474b3dbe1fe95b5abddf26/preview/preview.jpg?s=680x)
Jersey cows stand in a stall at Wickstrom Jersey Farms on Thursday, May 9, 2024, in Hilmar, Calif. The farm uses a diary digester to capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)
![Noah Berger A worker prepares a cow for milking at Wickstrom Jersey Farms on Thursday, May 9, 2024, in Hilmar, Calif. The farm uses a diary digester to capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/41507d56ef2f488b9d9caafd9efe64a5/preview/preview.jpg?s=680x)
A worker prepares a cow for milking at Wickstrom Jersey Farms on Thursday, May 9, 2024, in Hilmar, Calif. The farm uses a diary digester to capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)
![Noah Berger A separator removes solids from cow manure as Wickstrom Jersey Farms manager Brent Wickstrom discusses his farm's dairy digester on Thursday, May 9, 2024, in Hilmar, Calif. The farm uses a diary digester to capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/6265e3cde06440629dc5df91ffcc0f0d/preview/preview.jpg?s=680x)
A separator removes solids from cow manure as Wickstrom Jersey Farms manager Brent Wickstrom discusses his farm's dairy digester on Thursday, May 9, 2024, in Hilmar, Calif. The farm uses a diary digester to capture methane from cow manure which generates energy in an effort to reduce greenhouse gas emissions. (AP Photo/Noah Berger)
![Noah Berger A man passes a building on Main St. n Pixley, Calif, on Tuesday, May 21, 2024, Some residents say dairies located throughout the region produce air pollution that is hurting their community. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/46a53d34096547ed972f48c27f12e964/preview/preview.jpg?s=680x)
A man passes a building on Main St. n Pixley, Calif, on Tuesday, May 21, 2024, Some residents say dairies located throughout the region produce air pollution that is hurting their community. (AP Photo/Noah Berger)
![Noah Berger Andrew Zipser checks operations at an Aemetis biogas facility in Ceres, Calif., on Thursday, May 9, 2024. Local dairies use digesters to capture methane from cow manure which is then piped to the facility for processing. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/f8f8278e96b04c88aa7641cc45cf689f/preview/preview.jpg?s=680x)
Andrew Zipser checks operations at an Aemetis biogas facility in Ceres, Calif., on Thursday, May 9, 2024. Local dairies use digesters to capture methane from cow manure which is then piped to the facility for processing. (AP Photo/Noah Berger)
![Noah Berger Beverly Whitfield, who says pollution from dairies creates unhealthy air in her community, stands for a portrait in her kitchen on Monday, May 20, 2024, in Pixley, Calif. She believes her allergies, her adult son's asthma and others' breathing issues are linked to pollution from nearby dairies. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/07d189458c5a41159b92dcfb48dca36f/preview/preview.jpg?s=680x)
Beverly Whitfield, who says pollution from dairies creates unhealthy air in her community, stands for a portrait in her kitchen on Monday, May 20, 2024, in Pixley, Calif. She believes her allergies, her adult son's asthma and others' breathing issues are linked to pollution from nearby dairies. (AP Photo/Noah Berger)
![Noah Berger A water tower rises above Main Street in Pixley, Calif., on Tuesday, May 21, 2024. Some residents say dairies located throughout the region produce air pollution that is hurting their community. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/f9da625c3b654205976b594a1d46be18/preview/preview.jpg?s=680x)
A water tower rises above Main Street in Pixley, Calif., on Tuesday, May 21, 2024. Some residents say dairies located throughout the region produce air pollution that is hurting their community. (AP Photo/Noah Berger)
![Noah Berger Cows cast shadows on the ground at a Pixley, Calif., dairy farm on Monday, May 20, 2024. Some residents blame the region's dairy farms for creating unhealthy air quality. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/bc8bd1249cc243d58530dce727954d4d/preview/preview.jpg?s=680x)
Cows cast shadows on the ground at a Pixley, Calif., dairy farm on Monday, May 20, 2024. Some residents blame the region's dairy farms for creating unhealthy air quality. (AP Photo/Noah Berger)
![Noah Berger Environmental activist Maria Arevalo, 74, demonstrates the air machine she uses to treat sleep apnea on Monday, May 20, 2024, in Pixley, Calif. Arevalo said she believes her asthma and sleep apnea are linked to pollution from numerous dairies near her home. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/21a35ba945604ff5bca730ed2dcc1c1a/preview/preview.jpg?s=680x)
Environmental activist Maria Arevalo, 74, demonstrates the air machine she uses to treat sleep apnea on Monday, May 20, 2024, in Pixley, Calif. Arevalo said she believes her asthma and sleep apnea are linked to pollution from numerous dairies near her home. (AP Photo/Noah Berger)
![Noah Berger Cows stand in a corral at a Pixley, Calif., dairy farm on Monday, May 20, 2024. In recent decades, digesters that convert cow manure and other organic waste into biogas to create electricity or to fuel vehicles have spread nationally, and the number is expected to grow. (AP Photo/Noah Berger)](https://mapi.associatedpress.com/v2/items/409e31585df845db899d5e449eb960c7/preview/preview.jpg?s=680x)
Cows stand in a corral at a Pixley, Calif., dairy farm on Monday, May 20, 2024. In recent decades, digesters that convert cow manure and other organic waste into biogas to create electricity or to fuel vehicles have spread nationally, and the number is expected to grow. (AP Photo/Noah Berger)