A method of verifying regulatory compliance of a vehicle having a vehicle diagnostic system includes providing a vehicle unit having an adapter that is configured to connect with a vehicle diagnostic port of the 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. 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. The vehicle wireless communication transceiver is activated with one of the geographically dispersed wireless communication transceivers when the vehicle wireless communication transceiver is in a vicinity of that geographically dispersed wireless communication transceiver to communicate the stored vehicle data to that one of the geographically dispersed wireless communication transceivers. A host computer system with access to the communication network receives vehicle data from the geographically dispersed wireless communication transceivers. A database accessed by the host computer system collects environmental regulatory compliance data. Environmental authority is provided access to the database to verify regulatory compliance.