At the moment, the registration and the 5 minute idle rule are the only portions of the off road rules enforcible by the state UNTIL they get an exemption from the federal EPA for the stricter rules. That is according to the text on AQMD's website.
On the other hand, there are numerous owners and agencies adopting "special" rules on a job specific basis. The Ports of LA and Long Beach are one. Most of the Edison jobs require at least tier 2, and some of their jobs are listed requiring tier 3 or better only. Other cities, counties, and high profile owners have their own rules in place for what may be used on their projects. A lot of it is being forced by conditions placed on the permits for the work.
The current result of this is that machine owners are in the middle of a turf war between all the various agencies that want a piece of regulating them, and without the latest and greatest equipment, you never know if you will be allowed on the next job or not.:Banghead:Banghead:Banghead