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Delivered "Progress" devices not found toxic benzene in the air of the ISS

American gas delivered to the Russian cargo ship "Progress", is not found toxic benzene in the atmosphere of the International space station, said NASA.

Earlier the space Agency said that "the Progress MS-15", arriving at the station on July 23 was taken two detector Draeger and 90 test records to search for a source of benzene.

"Testimony (devices) at this point was below the threshold (their) sensitivity" - said on the NASA website.

It is noted that the crew will continue to make measurements approximately every other day depending on readings.

Benzene was recorded in the air of the ISS in April. First, its concentration remained at the level of 65 micrograms per cubic meter, and then began to rise. However, as reported in may, RIA Novosti news Agency "Roskosmos", the concentration did not exceed maximum permissible norm and do not threaten the crew.

The source of benzene is still not found. To reduce its concentration by the crew has installed carbon filters.

In June, the only device for locating the source of benzene - American analyzer air quality AQM-1 - broke down in June when conducting measurements in the Russian segment of the station. In this regard, the search was suspended until delivery of the new equipment on the "Progress MS-15".

Benzene is a colorless liquid with a specific sweet smell. Included in gasoline and used for production of drugs, plastics, synthetic rubber and dyes. Toxic and carcinogenic.

Now work on the ISS Russian cosmonauts Anatoly Ivanishin and John Wagner, as well as American astronaut Christopher Cassidy, Douglas Hurley and Robert Behnken.