University of Houston Researchers (IMAGE) University of Houston Caption University of Houston researchers Professor Yunsoo Choi and Delaney Nelson condcuted a study integrating the Positive Matrix Factorization (PMF) model with the SHAP algorithm of machine learning to pinpoint Houston's air pollution sources more accurately. Credit Please give photo credit to the University of Houston. Usage Restrictions Please give photo credit to the University of Houston. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.