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Ronald Cohen focuses on developing and applying new experimental and modeling strategies for understanding the chemical composition of the Earth’s atmosphere now and in the past and for predicting future changes. He explores the chemical formation of aerosol within the atmosphere and the kinetics of cloud formation.

His projects include:
1) The relationship between evaporation kinetics and the formation of cloud droplets
2) Chemical effects on the speed of cloud droplet growth
3) Role nitrogen oxides (NOx) play in the formation of secondary organic aerosol (SOA)