By a virus adjective
No it's a noun
smelly
Yes. It refers to not allowing air in or out.
Air raids is a noun.
Adjective
No, it is not. Broadcasters is a plural noun for either the companies or the on-air presenters. The possessive form (broadcasters') is used as an adjective.
The adjective 'pneumatic' means of or pertaining to air, gases, or wind; filled or inflated with air or gas.
tiny
The adjective 'pneumatic' means of or pertaining to air, gases, or wind; filled or inflated with air or gas.
No, it is not an adjective. Pollutant is a noun. Polluted would be an adjective.
Yes, it is. It means a relative abundance or velocity of moving air.