Podcast: Walt Smith Part 1

Scott Evans

March 13, 2019

Walt Smith can rightly be called “The Father of Stack Testing.” He’s been involved in environmental monitoring since before there was an EPA. Walt was one of the original EPA employees and is responsible for authoring many of the fundamental stack test methods still in use today, including Methods 1 – 8.

Recently, I had the pleasure of sitting down with Walt Smith for a chat about his remarkable 50+ years in the environmental monitoring field. We talked about his early days at EPA, how some of the stack methods testers use every day came into being, and his thoughts on the current state of emissions measurement.

Walt Smith

Currently, Walt offers training and consulting on a variety of emission measurement issues including QSTI training. You can contact Walt at Several of Walt’s current presentations are available below. Also, his paper describing the nomograph he developed that he talks about in the interview is also linked below.





How to Listen

Part 1 of this interview is available on iTunes, Spotify, Stitcher, or wherever you get your podcasts. Part 2 will be released shortly. See the links below.

Search for “Hot Air” or use one of the links below.

Listen on the web
Listen on iTunes
Listen on Spotify
Listen on Google Play
Listen on Stitcher

Recent Presentations from Walt Smith

Click each link to view presentation.

Pollutant Stratification

Chain of Custody

How to Get Good Data

Stack Gas Simplified (Nomograph Paper)


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