Dr Rajiv Garg, the director general of health services, wrote to principal secretaries (health) of all states and union territories (UTs), and national health mission directors in this regard.
source https://www.hindustantimes.com/india-news/ministry-warns-against-public-use-of-n-95-masks-with-valves/story-CM2b8yKcrD4U1SZ4gRAMXI.html
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