• The U.S. Embassy’s air pollution monitor covers the area of Chanakyapuri.  The data displayed is the U.S. EPA Air Quality Index.
• The Central Pollution Control Board air pollution monitoring sites cover the areas of Dilshad Garden, ITO, Shadipur, Delhi College of Engineering, and Dwarka.  The data is displayed in raw concentrations only and has not been converted to an Air Quality Index.
• The Indian Meteorological Department air pollution monitoring sites cover the areas of Mathura Road, Aya Nagar (Gurgaon area), IMD Delhi (Jor Bagh area), IGI Airport, IITM Delhi, Noida, Guru Teg Bahadur Hospital (Ghaziabad area), Dhirpur, Delhi University, Pitampura.  The data is displayed using IMD’s own air quality index, different from that of the U.S. EPA.  The numbers are not directly comparable. Click here for IMD operated “System of Air quality Forecasting And Research (SAFAR)” from Indian Institute of Tropical Meteorology (IITM), Pune.

Air Quality Index Levels of Health Concern	Numerical Value	Meaning
Good	0 to 50	Air quality is considered satisfactory, and air pollution poses little or no risk
Moderate	51 to 100	Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for Sensitive Groups	101 to 150	Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy	151 to 200	Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy	201 to 300	Health warnings of emergency conditions. The entire population is more likely to be affected.
Hazardous	301 to 500	Health alert: everyone may experience more serious health effects.