<prompt> Translate the following text to EnglishKama ilivyoelezwa katika jedwali, Sheria ya Clear Skies inatoa uboreshaji wa hali ya hewa kwa kiasi kidogo kwa karibu robo ya idadi ya watu wa Marekani.  <response>: As indicated in the table, the Clear Skies Act yields relatively modest air quality improvements for about one-fourth of the US population i.e. 