prov:value
| - However, it is accepted that in today's world, all atmospheric air has some degree of contaminants present in it, both particulate contaminants such as loose debris, insects, tree blossoms, dust, tree pollen, smog, and smoke particulates, and chemical contaminants such as volatile organic compounds (such as aromatic hydrocarbons, methane, butane, propane and other hydrocarbons) as well as ammonia,
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