In particular, temperatures greater than 199 °C (390 °F), were shown to produce a greater exposure risk than when bitumen was heated to lower temperatures, such as those typically used in asphalt pavement mix production and placement.
ɪn pɚtˈɪkjʊlɚ, tˈɛmpɹɪtʃɚz ɡɹˈeɪɾɚ ðɐn wˈʌnhˈʌndɹɪd nˈaɪnti nˈaɪn dᵻɡɹˈiːz sˈiː θɹˈiːhˈʌndɹɪd nˈaɪnti dᵻɡɹˈiːz ˈɛf, wɜː ʃˈoʊn tə pɹədˈuːs ɐ ɡɹˈeɪɾɚɹ ɛkspˈoʊʒɚ ɹˈɪsk ðɐn wɛn bɪtˈuːmɛn wʌz hˈiːɾᵻd tə lˈoʊɚ tˈɛmpɹɪtʃɚz, sˈʌtʃ ɐz ðoʊz tˈɪpɪkli jˈuːzd ɪn ˈæsfɔlt pˈeɪvmənt mˈɪks pɹədˈʌkʃən ænd plˈeɪsmənt.