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Pressure rising in one reactor at troubled nuclear plant --'Air containing radioactive substances will be emitted into the atmosphere.' 20 Mar 2011 Japanese officials said Sunday that they would have to release some radioactive gas into the air at the Fukushima Daiichi nuclear plant. The country's nuclear safety agency said releasing the gas was a necessary step to reduce mounting pressure in reactor No. 3's containment vessel -- the steel and concrete shell that insulates radioactive material inside.