Det er ikke en passende foranstaltning at lukke ned for kilderne til prækursorer, som f.eks. lukningen af en skorsten i en fabrik, der udsender røg, som er en prækursoragens for ozon, i atmosfæren.
Therefore, the solution to the problem of ozone concentration is extremely complex and simply shutting off the sources that generate precursor agents is not an appropriate measure. An example of this would be closing down a factory chimney that emits smoke, which is a precursor agent of ozone, into the atmosphere.