Tracer Data
Meteorological Data
Model Evaluation




About the transferred site

The site (Atmospheric Transport and Diffusion Data Archive) was created by John Irwin after he had retired from the US EPA in 2004.

Both during his professional career and in the time after John worked on making data available for the research community.

He added various data sets and other material to the web site in the period 2009 - 2016, until he passed away in August 2016.

In 2017, the contents of the site has been transferred to a set of pages under, namely

The web site has generally been retained as it was created by John Irwin, but with updated links.

A few pages have been added: is the web site of the initiative on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, which John Irwin contributed to from the early 1990's until his death.

The web pages have been transferred to by Helge Rørdam Olesen of Aarhus University, Denmark, with the assistance of Prof. S.T. Rao of North Carolina State University and Russ Lee of RF Lee Consulting.