Recently, rumors have been circulating online suggesting that drinking bottled water left in a car under the sun can cause cancer or even lead to death. This has sparked public concern and widespread questioning.

However, scientific and public health authorities have confirmed that no carcinogenic substances were found in bottled water stored in cars exposed to sunlight. In a controlled experiment, multiple brands of bottled water were placed in parked cars under direct sunlight for 1 to 7 days. The water was later tested using advanced equipment, and no dioxins, PCBs, or harmful chemicals were detected.

Plastic materials used for bottled water—such as PET, PP, and PC—must meet strict safety standards set by the Ministry of Public Health. These materials can withstand heat ranging from 60 to 95°C, making them safe for use even in hot conditions inside a car.

However, once a bottle has been opened, it is strongly recommended to finish the water within the same day. Open bottles can be contaminated by bacteria from the mouth or surrounding environment, especially in high temperatures.

Additionally, experts advise against reusing single-use plastic bottles, not because of chemical leaching, but due to the risk of bacterial buildup if not cleaned properly.

In summary, drinking water from an unopened plastic bottle left in a hot car does not pose a cancer risk or cause death. As long as the bottle remains sealed and properly stored, the water is considered safe to drink.

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