This document discusses the viability of using LoRa WAN for smart city applications. It summarizes the LoRa WAN technology, including its long range capabilities and low power consumption. It then describes two case studies of using LoRa WAN for air quality and congestion monitoring in London. The results show that LoRa WAN is a feasible low power solution for these types of smart city applications. Battery lifetimes of several years can be achieved, meeting requirements for monitoring networks. Therefore, LoRa WAN shows potential as an effective technology for implementing IoT in smart cities.