A:	Um, I'm not sure what contributes to air pollution exactly.
ʌ WORD_BOUNDARY ʌ m WORD_BOUNDARY aɪ m WORD_BOUNDARY n ɑ t WORD_BOUNDARY ʃ ʊ ɹ WORD_BOUNDARY w ʌ t WORD_BOUNDARY k ə n t ɹ ɪ b j uː t s WORD_BOUNDARY t ʊ WORD_BOUNDARY ɛ ɹ WORD_BOUNDARY p ə l uː ʃ ə n WORD_BOUNDARY ɛ ɡ z æ k t l i WORD_BOUNDARY