Record Sargassum Swamps Mexican Riviera

Mexico is urgently working to manage a historic influx of sargassum impacting its Caribbean coastline. The brown seaweed is inundating beaches in popular tourist areas like Cancun and Playa del Carmen. This year, Quintana Roo has already gathered more than 105,000 metric tons, significantly exceeding last year's record and earlier estimates for 2026.

This excessive growth is largely driven by nutrient-rich runoff, including nitrogen and phosphorus, combined with altered ocean conditions. As the sargassum decomposes on the shore, it releases hydrogen sulfide gas, causing an unpleasant odor and irritating respiratory systems, which can deter tourists.

The environmental minister of Quintana Roo indicated the season could continue until mid-October, with winds, currents, and tides influencing the duration. Cleanup workers describe the seaweed as a relentless presence, making control exceptionally difficult this year.

To address the economic impact on tourism, some businesses are developing ways to create value from the sargassum. Companies are processing the algae into products such as liquid biostimulants and fertilizers, aiming to offset the high expenses associated with its collection and removal.