Chemical Gases Categorization

Colored Gases: $$\text{NO}_2$$ (Brown), $$\text{Cl}_2$$ (Greenish-Yellow), $$\text{F}_2$$ (Pale Yellow), $$\text{Br}_2$$ (Red-Brown Vapors), $$\text{I}_2$$ (Violet Vapors).

• Pungent / Suffocating Gases: $$\text{NH}_3$$, $$\text{SO}_2$$, $$\text{HCl}$$, $$\text{Cl}_2$$.
• Poisonous Gases: $$\text{CO}$$ (Carbon Monoxide), $$\text{PH}_3$$ (Phosphine), $$\text{COCl}_2$$ (Phosgene).
• Paramagnetic Species: $$\text{NO}$$ (Monomer), $$\text{NO}_2$$ (Monomer), $$\text{O}_2$$, $$\text{ClO}_2$$.