The Internet of Things is the network of things, with device identification, embedded intelligence, and sensing and acting capabilities, connecting people and things over the Internet. Examples of things include physical devices, vehicles, home appliances and many types of sensors and actuators. The number of IoT devices was estimated to 8.4 billion in 2017 and it is estimated that there will be 30 billion devices by 2020. Over 70% of the IoT devices require GNSS sensors for location intelligence or sensing capability. GNSS and indoor positioning devices could expect biggest ever opportunities in various IoT markets. An important problem is that the current GNSS infrastructure and data analytics do not necessarily support the required positioning needs for tens of billions of IoT devices well. In this presentation we define the GNSS Fog stations and framework to support deployment of IoT industry applications where location intelligence or GNSS sensing are critical. A GNSS fog station refers to a platform for integrated GNSS computing, storage, and network services that can be distributed, virtualized and mobile. This platform can extend in locality from IoT end devices and gateways, GNSS reference stations all the way to GNSS cloud data centers, but is typically located at the IoT network edge close to the IoT-GNSS data sensors. A GNSS Fog station is not an alternative to GNSS data centre or a reference station; rather, the three synergistically interplay in order to enable effective deployment of new types and classes of IoT applications that otherwise would have been very difficult or complicate to deploy if relying on cloud server and current continuous operating reference stations. As a result, GNSS fog stations can reduce the complexity of PVT services for IoT applications. The presentation will study the requirements for static, dynamic or kinematic geodetic datum for position, vehicle and time (PVT) information in some initially identified industry use cases. Roadside GNSS fog stations to support traffic and connected vehicle safety applications, fixed fog station on a construction site to monitoring the landslides and structure health, and moving fog stations on surveying vessels, and high-speed trains.