Ering was a member of the
Arunachal Pradesh Legislative Assembly representing
Pasighat East constituency as an
independent candidate from 1990 to 1995. In 1995, he again contested from the same constituency as an independent candidate, but he was defeated by the Congress candidate Tobar Jamoh. From 1999 to 2004 he again became a member of the Arunachal Pradesh Legislative Assembly representing the same constituency as a Congress candidate. From 1999 to 2002, he was the Minister of State of the Government of Arunachal Pradesh and from 2002 to 2004, he was the Deputy Speaker of the Arunachal Pradesh Legislative Assembly. In 2009, he was elected to the
15th Lok Sabha, where he was a Member of the Standing Committee on Science & Technology, Environment & Forests and a Member of the Consultative Committee, Ministry of Civil Aviation. He was re-elected to
16th Lok Sabha from the same constituency in 2014 and again served as member of the Standing Committee on Science & Technology, Environment & Forests and the Consultative Committee, Ministry of Petroleum and Natural Gas. The bill triggered a nationwide debate and brought India in the list of countries like Italy, South Korea, Japan where the law existed or was debated. Ering also asked a question on whether the government has any plan to propose menstrual leave at the workplace. In its reply, the Ministry of Women and Child Development said there was no such proposal and also the ministry did not have any plan for a legislation on the issue. The Ministry, however, listed a number of awareness efforts for adolescent girls. Ninong Ering in his interview to The BloombergQuint congratulated his entire team and thanked his PRS Legislative Research LAMP Fellows for working on the bill. [https://www.pscp.tv/w/1mrxmZQYpEWKy This initiative gained a nationwide support and Ninong Ering received applause from a number of women activists organisations.
Criticism of Swami Ramdev On 19 February 2011, Ninong Ering allegedly criticised the anti-corruption drive of Indian religious leader
Swami Ramdev and referred to him as a "bloody dog". The
Bharatiya Janata Party criticised the remarks, stating that Ramdev was a revered figure and further if Mr. Ering did not consider himself to be Indian then he should excuse himself from the Indian Parliament. The Congress party claimed that it had asked for explanation from Ering on this matter. ==Personal life==