Don't go to the underground garage for workouts on rainy days-瞭望新时代网-瞭望时代，放眼世界

Don't go to the underground garage for workouts on rainy days

2026-07-06

During rainy seasons, parks become slippery with puddles on running tracks, leading many to choose underground garages as fitness spaces. While these areas offer shelter from rain and comfortable temperatures year-round, they may actually be one of the least suitable places for prolonged exercise on rainy days. Poor ventilation, high humidity, lingering vehicle exhaust, and the potential accumulation of a dangerous gas often overlooked by most—radon—make them risky environments. Radon: A Class 1 Carcinogen Radon (symbol: Rn) is a naturally occurring radioactive inert gas. The World Health Organization classifies it as a Class 1 carcinogen, recognizing it as a major environmental risk factor for lung cancer, second only to smoking. It has several particularly hazardous characteristics: Invisible and undetectable: Colorless, odorless, and tasteless, it provides no sensory warning of its presence. Radioactive by nature: Radon is unstable and continuously decays, emitting radiation. The real danger lies in its "daughters": While some inhaled radon is exhaled, its decay products—polonium, lead, and bismuth—attach to dust and aerosols. When inhaled, these particles deposit on the bronchial and lung surfaces. Where does radon come from? In open outdoor spaces, rapid air circulation quickly dilutes radon, preventing significant accumulation. However, underground garages, basements, and cellars—spaces in direct contact with soil and relatively enclosed—trap radon easily. It seeps indoors through foundation cracks, wall gaps, pipe penetrations, and around floor drains. The more sealed and poorly ventilated the space, the higher the radon concentration. Rain acts as an underestimated "amplifier." Rainfall alters soil gas distribution and pressure. Increased soil moisture forces gases trapped in soil pores to escape, enhancing radon migration into underground structures. Invisible vehicle exhaust remains a persistent hazard even when vehicles are not actively running. Underground garages with frequent vehicle turnover, short idling periods, and cold starts become hotspots for exhaust accumulation. Carbon monoxide displaces oxygen in the blood, causing dizziness, fatigue, and nausea; nitrogen oxides irritate the respiratory system, worsening asthma and bronchitis; volatile organic compounds like benzene, toluene, and xylene, along with particulate matter from exhaust, tire, and brake wear, all pose risks to cardiovascular and respiratory health. Regardless of weather, underground garages should not replace well-ventilated indoor spaces like gyms, community activity centers, or standardized shopping mall walkways for walking, running, childcare, or exercise routines. If indoor activity is needed on rainy days, prioritize spaces with proper air circulation. （Source: Liaowang New Era）

Edit：WENWEN Responsible editor：LINXUAN

Source：CCTV News

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