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ISS crew has detected toxic odor from docked Russian cargo spacecraft

On November 23, the crew aboard the International Space Station (ISS) reported an unusual odor when opening the hatch of the recently docked Russian Progress MS-29 cargo spacecraft, leading to the immediate implementation of decontamination procedures according to a tweet posted by International Space. Station on platform

As reported by multiple sources, the source of the odor, described by NASA astronaut Don Pettit as “reminiscent of spray paint,” initially raised concerns about possible contamination within the Russian portion of the ISS.

While Pettit’s description marked Due to the intensity of the odor, NASA and Roscosmos both activated air purification systems to address the potential risk. The American segment deployed its Trace Contaminant Control Subassembly (TCCS), while additional filter systems were deployed in the Russian module to restore air quality. As a further precaution, all crew members wore personal protective equipment (PPE), the official handle of the ISS clarified in a after.

Continuous monitoring guarantees the safety of the crew

With air sensors continuously monitoring the surrounding area, flight controllers confirmed on November 24 that the station’s air quality had returned to safe levels. This update allowed the crew to reopen the hatch between the Poisk and Progress modules without any risk. Although the specific source of the odor remains under investigation, officials have indicated that there are currently no safety concerns for the crew and that air quality has returned to normal levels according to several reports.

Routine resupply mission remains unaffected

Progress MS-29, part of a standard resupply mission, launched from the Baikonur Cosmodrome on November 21, delivering essential items such as food and fuel to the ISS. The spacecraft will remain docked for the next six months before transporting the waste material back to Earth. Despite the initial warning, ISS operations have been confirmed to continue as planned, with safety protocols in place to ensure station operations are not interrupted.

Sources at NASA and Roscosmos have assured that efforts are being made to identify the origin of the odor and further preventive measures will be implemented if necessary.

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