| http://www.w3.org/ns/prov#value | - rule, which limits exhaust that could remain in the air for a one-hour period.The 100 parts-per-billion limit was intended to reduce smog from such sources as car exhaust pipes and factories; it was more stringent than a standard dating from 1971.Nitrogen oxides have been linked to respiratory problems, especially in children and people with asthma, according to the EPA.We cannot conclude the ag
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