Oops, it doesn't look like 'environmental health day' is a national day..

Other days

kale

Kale Day
boy friend

Boy Friend Day
eat what you want

Eat What You Want Day
ruby

Ruby Day
bow tie

Bow Tie Day
cuddle up

Cuddle Up Day
bounce

Bounce Day
law

Law Day
hoodie

Hoodie Day
believe

Believe Day