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http://www.pdxmonthly.com/articles/2016/3/25/weve-got-19-new-facts-about-portland-s-totally-insane-real-estate-market #.Vwu4k46ct4g.facebook

We've Got 19 New Facts About Portland’s Totally Insane Real Estate Market From steepest price spikes to wealthiest hoods, we crunched the numbers. Here’s what we found.

Due to the glass-making company's use of arsenic, cadmium, lead and nickel, there are very high concentrations of exposure in some parts of the city. This map is great because you can input your address to see if your property is affected.
http://projects.oregonlive.com/air-pollution/heavy-metals/testing/

Interactive map: Heavy metals in Portland See where testing has found elevated levels of heavy metals in Portland.