India – Ambient Monitoring Data

These plots are updated every 30 minutes and available as box plots (looking at the variation in concentrations within a day) and as time series (looking at the variation in concentrations by hour) for the last 8 days; for five criteria pollutants – PM2.5, PM10, Nitrogen Dioxide (NO2), Carbon Monoxide (CO), and Ozone.

Ambient monitoring data is pooled from multiple sources (only the sources with data feeds in the public domain). The continuous monitoring stations accessed for this exercise are operated and maintained by the Central Pollution Control Board (CPCB) and the State Pollution Control Boards. All the data from these stations is available from CPCB website. A secondary source to download archived data is @ (this is a portal with open access to monitoring data from stations across the globe; and also allows you to download data for select station or city or time period; compare data between stations, between cities, visualize the trends spatially and temporally, and much more). Other networks are the following

Air Quality Index (AQI)

AQI color code in the box plots is based on national methodology as proposed by the Central Pollution Control Board (New Delhi, India). It is very important to note that these index methodologies vary significantly between countries and it is not advised to compare AQI values between countries or cities; which can result in misleading understanding and/or measures. Here is an infograph showing a comparison of the break points practiced in India, China, and 4 other countries.

AQI for Indian cities is also reported by AQICN (a Chinese AQI portal) using their methodology for all the global cities. A different AQI is reported by the Indian Institute of Tropical Meteorology (IITM) based on their methodology developed under the national SAFAR program (click here for a how to use the SAFAR-Air app on phones)


March, 2016 – A call for open air pollution information

How do we improve Delhi’s graded responsibility action plan for better air quality
Op-Ed in the WIRE (2017) Download

What will it take to make Indian cities environment smart?
Commentary article in India Together (2015)
Info graph with methods to report air quality index (2015) Download

The polluted air we breathe
Op-Ed in the Hindu (2015) Download