Something Smelled Like It Was Burning... Woman in Her 20s Dies in Suspected Chemical Poisoning at Brazilian Swimming Pool

A suspected chemical poisoning accident occurred at a health club swimming pool in Parque Sao Lucas in eastern Sao Paulo, Brazil, leaving a woman in her 20s dead and four people receiving hospital treatment.

On February 11, Yonhap News TV reported on the accident at a Brazilian swimming pool, citing CNN Brasil and other outlets. The accident took place on February 8, while a swimming class was in progress inside the pool. At the time, a strong chemical smell spread throughout the indoor area, and students reported a burning sensation in their eyes, nose, and lungs, and some were said to have experienced vomiting.

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A 27-year-old woman was taken to a nearby hospital but ultimately died. Her husband, who was attending the swimming class with her, is also hospitalized due to a rapid deterioration in his health. A 14-year-old teenager was admitted with symptoms of blistering in the lungs, and in total there were five casualties, including the deceased and the injured.

Police investigating the case stated that the pool operator closed the facility immediately after the accident and did not report it to the authorities. Investigators forcibly opened the building entrance to conduct an on-site inspection. The police are focusing on whether chemicals were incorrectly added during the water treatment process, or whether any unauthorized substances were used. The pool operator said, "We deeply mourn the accident and are fully cooperating with the investigation by the relevant authorities."

Swimming pool water quality is generally managed by using chlorine-based disinfectants to eliminate bacteria and viruses. However, if chlorine is overdosed or mixed with acidic substances, harmful agents such as chlorine gas can be generated. In the case of indoor pools, if the ventilation system does not function properly, there is a risk that gas concentrations may rise sharply.

In Korea, swimming pool water quality is managed under the Public Health Control Act. As a general rule, the free residual chlorine concentration must be maintained in the range of 0.4 to 1.0 mg/L, and the pH must be controlled between 5.8 and 8.6. Turbidity and the presence of coliform bacteria, among other factors, are also subject to regular testing. Local governments verify water quality test results through periodic inspections, and if the standards are exceeded, they can issue corrective orders or impose business suspension.

Large sports facilities are typically equipped with automatic water quality measuring devices and automatic chemical dosing systems. These devices are designed to sense chlorine concentration and pH in real time and automatically adjust them if they fall outside the prescribed range. However, many small and medium-sized indoor pools or health club-affiliated pools still rely on manual management due to staffing and budget constraints. In such cases, if there is a measuring error during chemical dosing or equipment malfunction, there is a risk that concentrations may change abruptly in a short period of time.

In addition, water quality standards apply to the "water" itself, but in indoor swimming pools, air quality management is equally important. Chloramines (chlorine by-products) generated during chlorine disinfection can accumulate in the air just above the water surface, and if ventilation is insufficient, users may experience eye irritation, coughing, and breathing difficulties. Particular caution is required for children, the elderly, and people with underlying respiratory diseases, as they are more vulnerable.

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