Ko te punaha whakamatautau whakamaarama mamao poutū kua hangaia mo nga waka penehīni me nga waka diesel, ka taea te kite i te opacity, te matūriki (PM2.5), me te haukini (NH3) o nga waka penehi me te diesel.
Kei roto i te punaha whakamatautau tairongo mamao poutū he puna marama me te wae tātari, he wae whakaata hurihanga koki matau, he punaha hopu tere/whakatere, he punaha tohu waka, he punaha tuku raraunga, he punaha mahana tonu o te rūnanga, he punaha meteoro me tetahi wae mahi, ka taea te whakahaere mamao ma te whatunga.