The ISS has set another filter to reduce the level of toxic benzene

Another carbon filter is installed in the U.S. segment of the International space station with the aim of reducing concentrations of toxic benzene in the air, said NASA.

"The crew installed a backup carbon filter to ensure additional purification of the atmosphere to further reduce the level of benzene on the ISS," - said on the NASA website.

It is noted that the filter is mounted in the American module Destiny. Before it was reported about the installation with the same purpose of carbon filters in the module Unity.

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. The only device to search for it - American analyzer air quality AQM-1 - broke down in June when conducting measurements in the Russian segment of the station. As reported by RIA Novosti source in the space industry, a new device must bring to the ISS the cargo ship "Progress MS-15", the launch of which is planned for July 23.

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.