Data collection (IMAGE) Stanford University Caption Stanford PhD student Metta Nicholson observes a gas burner in a home where scientists measured air pollution as part of their data collection in California, Texas, Colorado, New York, and Washington, D.C.. Credit Rob Jackson, Stanford Doerr School of Sustainability Usage Restrictions Credit required 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.