Influence of 1-butanol and 1-pentanol addition to diesel fuel on exhaust and noise emissions under stationary and transient conditions

•Influence of higher alcohols in stationary and transient operation has been studied.•Higher alcohols in diesel fuel blends increases H:C ratio and latent heat of vaporization.•Increase of higher alcohols in blends reduces PM (number and mass) and increases THC.•Higher alcohols in blends reduces NOx in stationary, but increases in transient operation.•Butanol blends provide the highest reduction of engine overall noise.•Overall noise level decreases when higher alcohol/diesel fuel mixtures are used.