The Indian Express, New Delhi, Jan 2017: 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