Abstract: A vehicle environmental regulatory compliance system and method of verifying regulatory compliance of a vehicle includes providing a vehicle unit having an adapter that is configured to connect with a vehicle diagnostic port of a vehicle diagnostic system. The vehicle unit further includes a vehicle wireless transceiver and a memory. The adapter is connected with the vehicle diagnostic port and receives vehicle data including exhaust emission parameters. The vehicle data is stored in the memory. When the vehicle is powered on a check is made to ensure that the adapter is connected with the same vehicle. A communication network is provided for two-way wireless communication with the vehicle unit. The communication network is made up of a plurality of geographically dispersed wireless communication transceivers.