Contributors can be to (water pollution).Logical formLearned from9 sentences. Pollution can be in cities.Logical formLearned from9 sentences. Lawnmowers may be blamed for (air pollution).Logical formLearned from9 sentences. Pollution can be in air.Logical formLearned from9 sentences. Pollution may spread a number of dead zones.Logical formLearned from9 sentences. An (air pollution) can be horrendous.Logical formLearned from9 sentences. Pollution may pertain-to a footstep.Logical formLearned from9 sentences. Pollution can be in a country.Logical formLearned from9 sentences. A renewable-energy source may reduce pollution.Logical formLearned from9 sentences. A light pollution may pertain-to a city.Logical formLearned from9 sentences. (Air pollution) may pose a risk to athletes.Logical formLearned from9 sentences. Wells may undergo pollution.Logical formLearned from9 sentences. Air may be clogged with pollution.Logical formLearned from9 sentences. Pollution can be concentrated.Logical formLearned from9 sentences. Some percent can be constituted-of-or-filled-with some (air pollution).Logical formLearned from9 sentences.