jˌuːˈɛs ɪmˈɪʃən stˈændɚdz spəsˈɪfɪkli lˈɪmɪt ɪmˈɪʃənz fɹʌm ðiːz smˈɔːl ˈɛndʒɪnz, wˌɪtʃ ɑːɹ bˌiːɪŋ fˈoːɹst tə bɪkˌʌm mˈoːɹ ɪfˈɪʃənt ænd lˈɛs pəlˈuːɾɪŋ.
US emission standards specifically limit emissions from these small engines, which are being forced to become more efficient and less polluting.