State emissions laws vary from state to state as the laws are determined by each state for its residents.  These laws concern different emissions testing policies and procedures such as how often your vehicle needs to go to emissions for testing, the fees associated with testing, the procedure if your vehicle fails its emissions test, whether the testing inspection locations are located centrally in one place or whether testing sites are statewide, what type of documentation you need in different steps of the emissions testing or retesting process, among many other rules and policies.  Each state can amend their emissions testing policies  if they choose and states the require emissions testing could change to no longer require emissions testing or if states do not require emissions testing they could change to require testing.

States may have their own department specifically for emissions testing or they may use a department (such as the DMV) that is already in place to administer the emissions testing program.  Each state should have a help line available for you to reach someone to speak with concerning that state’s emissions program.  State laws are administered by the state but each state’s laws must comply with federal guidelines.  When a state makes a change to their emissions program the usual process is to give residents an advance warning (usually a few months at least) of the policy change so that people can understand the implications of the change prior to the change actually occurring.  Once a state emissions law goes into effects all residents of that state must abide by those laws.  If you move from one state to another you will be expected to comply with the emissions laws of the state you will be residing in.  Most states require new residents to have their vehicle’s emissions tested prior to receiving a new registration for the vehicle within that state.  It is recommended you research the local state laws if you are moving into a different state.

To find out the different laws and policies for the emissions program in your state select your state from below to visit that state’s section on  Each state’s section will have information pertaining to that select state so that you can find out the specific emissions information that you need to know.