A Transparent Cloud Of Flatulence Or Nitrogen (N-7) & Oxygen (O-8) To Make The Element "Gas" Of Which Is Then With The Help From The Element Arsenic (As-33), Become's Poisonous & Toxic To Breathe In, This Is By Default Usually Purple/Violet In Color Within Cartoon's & Other Social Media To Show That That Air Is Poisonous Or Toxic To The Living, But You Can Make It Any Color You Want If You Are Feeling Creative, This Can Be Used For Breath play As This Is A Type Of Breath play That Can Change When Or Where You Can Breathe In Air.