<prompt> Translate the following text to SwahiliIt is time to revisit and update the Clean Air Act once again in order to achieve the additional reductions needed to address public health and environmental problems in the most cost effective manner.  <response>: Wakati umefika wa kuchunguza tena na kusasisha Sheria ya Hewa Safi ili kufikia kupunguzwa kwa ziada kunahitajika kushughulikia matatizo ya afya ya umma na mazingira kwa njia ya gharama nafuu zaidi. 