Close banner

Support Outside Online

Love Outside?

Help fund our award-winning journalism with a contribution today.

Contribute to Outside

Cows Contribute to Los Angeles Smog

Emissions may be triple that of cars

A new study published in Geophysical Research Letters concludes that ammonia emissions from Southern California dairy cattle are a significant source of smog in Los Angeles. The National Oceanic and Atmospheric Administration gathered data on fly-overs in the Southern California air basin in May and June 2010, resulting in estimates ranging from 33 tons to 176 tons of cow ammonia per day, compared to 62 tons from car emissions. The calculations are based on the 298,000 head of cattle in the region during the study, though the Dairy Herd Network says that only 100,000 cows remain. Ammonia creates smog only when mixed with nitrogen oxides not originating from farms.

Read more at TreeHugger

Support Outside Online

Our mission to inspire readers to get outside has never been more critical. In recent years, Outside Online has reported on groundbreaking research linking time in nature to improved mental and physical health, and we’ve kept you informed about the unprecedented threats to America’s public lands. Our rigorous coverage helps spark important debates about wellness and travel and adventure, and it provides readers an accessible gateway to new outdoor passions. Time outside is essential—and we can help you make the most of it. Making a financial contribution to Outside Online only takes a few minutes and will ensure we can continue supplying the trailblazing, informative journalism that readers like you depend on. We hope you’ll support us. Thank you.

Contribute to Outside
Filed To: News