A (smog cloud) can be dangerous.Logical formLearned from5 sentences. A (smog cloud) may be caused by bogs.Logical formLearned from5 sentences. Skies may be mixed with white clouds.Logical formLearned from5 sentences. An (oil cloud) may end.Logical formLearned from5 sentences. Clouds of black oil may gush unchecked.Logical formLearned from5 sentences. Clouds can be constituted-of-or-filled-with black oil.Logical formLearned from5 sentences. An (ash cloud) may cause disruption.Logical formLearned from5 sentences. Clouds can be oily.Logical formLearned from5 sentences. An (ash cloud) may affect airports.Logical formLearned from5 sentences. A cloud may remain off a coast.Logical formLearned from5 sentences. A (gas cloud) may cover a rig.Logical formLearned from5 sentences. (Flight restrictions) may be caused by an (ash cloud).Logical formLearned from5 sentences. Effects may pertain-to a cloud.Logical formLearned from5 sentences. A no-fly zone can be over an (ash cloud).Logical formLearned from5 sentences. An (ash cloud) may drift across a continent.Logical formLearned from5 sentences.