Monitoring of air quality, which forms the basis of the graded response action plan to curb air pollution in Delhi-NCR, has been patchy for long. In the 46,208 square kilometre area that forms the Delhi-NCR, there are only 51 air quality monitoring stations. Of these, 28 are in Delhi alone. Gurgaon district has only two air quality monitors – one run by the Central Pollution Control Board (CPCB) and one by the India Meteorological Department. Noida, at present, has only two stations. The scenario, however, is even worse outside the Delhi-NCR region.
