The weather pattern was identified as one of the most important driving factor for rain acidification but also the timing of the eruption plays an important role, especially regarding the chemical behaviour of the sulphur species.
Veðuraðstæður hafa mikil áhrif á súrnun regns, en einnig spilaði tímasetningin mikilvægt hlutverk, þar sem mörg efnahvörf brennisteins eru háð sólgeislun, auk hitastigs og raka.