Figure 4From: Emergency room visits for respiratory conditions in children increased after Guagua Pichincha volcanic eruptions in April 2000 in Quito, Ecuador Observational Study: Time Series AnalysisA composite map of ash deposition from Pichincha eruptions (October 1999 – July 2000) demonstrating the extensive area affected by ashfalls. Footnotes: The map has been modified from the images of the Volcano Ash Advisory Archive [21], courtesy of Dr. Yepes, the Geophysical Institute of Ecuador.Back to article page