John,
Manufacturing companies have to follow these Tier 4i/Stage 3a rules here in the US and in the EU at the same time. The regulation is the same.
In California the intent of the Air resources board is to not just add new machines with cleaner engines but to make companies get rid of all Tier 0 machines now and Tier 1 machines in the near future and also install diesel particulate filters of up to 20% of a fleets horsepower every year. All this is what was going to needed to be to be compliant.
A real inventory of the emissions emitted by construction equipment in the state by late 2009, (after all construction fleets were registered and each engine was placed in a huge database), the CARB is now reassessing what to do now with emission levels 200% less then expected from their estimates.
A construction company, dealer, rental company or manufacturer does not have a clear path to emissions solutions. Companies have spent MILLIONS to become compliant and now seems to have wasted this money.
CARB is a great example of why government doesn't work.
Rod