• An inspection done by experts from the Central Pollution Control Board (CPCB) and the National Environmental Engineering Research Institute (NEERI) in December 2018 largely attributed the high levels of ammonia in the Yamuna river reaching Delhi to pollution from drains in Haryana.

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• Experts from CPCB and NEERI were asked by the YMC in December 2018 to identify sources of high ammonia levels in the river between Haryana’s Hathnikund and Delhi’s Wazirabad barrage.
• Among the observations made by the inspection team was that water quality of the
  river begins to deteriorate after Yamuna Nagar and Panipat, down stream of the Hathnikund barrage.