Hettiarachchi was recognized for his paper, 鈥淎 Field-Verified Model to Estimate Landfill Methane Flux Using Surface Methane Concentration Measurements under Calm Wind Conditions,鈥� on which he collaborated with the landfill research team from the University of Calgary鈥檚 Centre for Environmental Engineering Research and Education. The article was published in the  Journal of Hazardous, Toxic, and Radioactive Waste and proposes a simple and cost-effective way to estimate methane emissions from landfills as an alternative to traditional measurement methods that are more complex and expensive.