Expressing concern over the high level of ammonia in the Yamuna that has made the Delhi Jal Board shut down the Chandrawal and Wazirabad water treatment plants leading to an acute scarcity of water, Leader of Opposition in Delhi Assembly Vijay Kumar Malhotra has asked Chief Minister Sheila Dikshit to immediately hold a meeting with her counterparts in neighbouring Punjab, Haryana, Rajasthan and Ut