In 2020, scientists reported that bitumen currently is a significant and largely overlooked source of air pollution in urban areas, especially during hot and sunny periods.
ɪn tˈuː θˈaʊzənd twˈɛnti, sˈaɪəntɪsts ɹᵻpˈoːɹɾᵻd ðæt bɪtˈuːmɛn kˈɜːɹəntli ɪz ɐ sɪɡnˈɪfɪkənt ænd lˈɑːɹdʒli ˌoʊvɚlˈʊkt sˈoːɹs ʌv ˈɛɹ pəlˈuːʃən ɪn ˈɜːbən ˈɛɹiəz, ɪspˈɛʃəli dˈʊɹɹɪŋ hˈɑːt ænd sˈʌni pˈiəɹɪədz.