Asphalt Based Sealants vs Coal Tar Sealants and Sustainable Roads

https://www.usgs.gov/news/coal-tar-sealant-a-major-source-pah-contamination-milwaukee-streams

Asphalt based sealants have less pollutants compared to tar sealants.

What is the best road sealant or material?

http://www.worldhighways.com/categories/asphalt-paving-compaction-testing/features/sustainable-road-construction-current-practices-and-future-concepts/

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