水土保持与防止和降低空气污染；
Water and soil conservation and preventing and reducing air pollution;
这些过滤装置将未燃烧的一氧化碳含量降至最低，降低空气污染。
These filters reduce air pollution by minimizing the discharge of unburned carbon monoxide.
在不超过健康标准的浓度下，臭氧对降低空气污染没有任何帮助。
Available scientific evidence shows that, at concentrations that do not exceed public health standards, ozone is generally ineffective in controlling indoor air pollution.
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