 She later described the post as not her "most impressive piece of work" and noted that it was written when she had first started blogging.In a widely discredited 2011 post, Hari warned readers that the air pumped into aircraft cabins was not pure oxygen, complaining it was "mixed with nitrogen, sometimes almost at 50 per cent" despite ambient air being 78% nitrogen.Hari deleted the post, later claiming it contained an "inadvertent error".