line source
...that line source is a mathematical construct used to analyze roadway air and noise pollution, but was not developed as a meaningful tool until 1970 when major U.S. laws spurred extensive environmental modelling?
...that <b id="mwBvo"><a href="./Line_source" id="mwBvs" rel="mw:WikiLink" title="Line source">line source</a></b> is a mathematical construct used to analyze roadway <a href="./Air_pollution" id="mwBvw" rel="mw:WikiLink" title="Air pollution">air</a> and <a href="./Roadway_noise" id="mwBv0" rel="mw:WikiLink" title="Roadway noise">noise pollution</a>, but was not developed as a meaningful tool until 1970 when major <a href="./Law_of_the_United_States" id="mwBv4" rel="mw:WikiLink" title="Law of the United States">U.S. laws</a> spurred extensive <a href="./Environmental_science" id="mwBv8" rel="mw:WikiLink" title="Environmental science">environmental</a> <a href="./Mathematical_model" id="mwBwA" rel="mw:WikiLink" title="Mathematical model">modelling</a>?