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Based on estimation with the QSAR model AOPWIN, (version 4.10, EpiSuite 2013, CC(C)C(=O)OC3CC1CC3C2CC=CC12), Cyclabute undergoes in air rapid degradation after reaction with hydroxyl radicals or ozone. The DT50 values of the substance after reaction with hydroxyl radicals and ozone are 1.9 hours and 1.4 hours, respectively. This estimated half-life time is much shorter than 2 days, which is the cut off time for reaching the stratosphere. Cyclabute is therefore not expected to reach the stratosphere and is not a long-range transported chemical in air. Cyclabute does not have an ozone depletion potential. Besides this information the substance does not contain halogens in accordance with EU CLP (EC, 1272/2008 and its amendments). 

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