dᵻfjˈuːzd pəlˈuːʃən ɪz dˈɪfɪkəlt tə kəntɹˈoʊl bɪkˈʌz ɪt hɐz ɐ mˈʌltɪtˌuːd ʌv sˈoːɹsᵻz θɹuːˈaʊt ðə hˈoʊl ɹˈiːdʒən.
Diffused pollution is difficult to control because it has a multitude of sources throughout the whole region.