EPA Diesel Emissions Standards

Tier 4 emissions came up in class today.

For your study pleasure...here is a start (;

http://www.epa.gov/cleandiesel/publications.htm

http://www.deere.com/en_US/media/player/player.html?src=s/flash/deerecompany/ag/large_ag/jdengine_works_updated_h.mp4&autostart=true

http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&sid=4e682848caefcf357016489b39d59d1c&rgn=div8&view=text&node=40:19.0.1.1.2.1.1.32&idno=40