This report presents the results of an air quality performance evaluation project. The goal of this project is to deploy 50 real-time air quality monitors (known as "Atmos") spread over 10 Indian cities, evaluate the performance of and provide contextual analytics of this data in periodic reports. This is one of the first projects in India which has developed a nationwide real time PM2.5 monitoring network which has been scientifically evaluated in multiple locations. The sensor-based data from this air quality monitoring network has been published in peer-reviewed journals. Additional evaluations of PM10 sensor data has been performed in lab and field conditions and the results of the same have been submitted for peer-review. The specific 10 city project has entailed deploying Atmos monitors in the following cities: Ahmedabad, Bhopal, Chandigarh, Dehradun, Delhi/Gurugram, Jaipur, Kanpur, Raipur, Ranchi, Patna, Varanasi. Data from 5 of these cities – Chandigarh, Kanpur, Patna, Raipur, Varanasi has been evaluated in this report.