<prompt> Translate the following text to SwahiliFinal Heavy-Duty Engine Diesel Fuel Air Quality Estimation, Selected Health and Welfare Benefits Methods, and Benefit Analysis Results.  <response>: Utafiti wa mwisho wa ubora wa hewa ya mafuta ya dizeli ya injini nzito, mbinu zilizochaguliwa za faida za afya na ustawi, na matokeo ya uchambuzi wa faida. 