That Rotten Egg Smell on the Beach Could Be Harming Your Health
Scientists Are Now Measuring the Toxic Gases Released by Rotting Sargassum, and the Results Are Raising Serious Concerns for Coastal Communities

Puerto Morelos Insider
May 26, 2026
That stinky smell coming from rotting seaweed on the beach is not just gross, it could actually make you sick.
Scientists are now tracking the gases released by decomposing sargassum, and what they're finding is alarming.
The Smell Is a Warning Sign
Researchers in Playa Del Carmen recently set up a special monitoring station to measure the gases sargassum releases as it rots.
The station measures carbon dioxide, methane, ammonia, and compounds related to sulfuric acid, including hydrogen sulfide, the gas behind that rotten egg odor.
The biggest concern is hydrogen sulfide. The EPA says breathing it for too long can cause headaches, nausea, dizziness, and even neurological problems.
Puerto Morelos Is One of the Most at Risk
Puerto Morelos is one of three spots along the Riviera Maya most vulnerable to sargassum.
The seaweed even started arriving earlier than usual this year, showing up in January instead of March. Local officials are working hard to protect 20 kilometers of coastline using offshore barriers.
What You Should Do
Stay away from large piles of rotting sargassum, especially when the smell is strong. Move upwind if you can, and people with asthma should be extra careful.









































































































































































