Air pollution refers to a general noun and it is singular.
Singular
Plural It is air ways, Of course it is plural!
Yes, the word "air" is a noun or a verb.The noun air is a word for the atmosphere, or the "air" or feel of a location.The verb "to air" means to present or show, or to place in the air for cooling, freshening, or cleaning.
practitioner is singular (plural practitioners)sofa is singular (plural sofas)satellite is singular (plural satellites)clips is plural (singular clip)dentist is singular (plural dentists)dollars is plural (singular dollar)article is singular (plural articles)magazines is plural (singular magazine)laminator is singular (laminators is plural)radios is plural (singular radio)
singular and plural
Singular: book / Plural: books Singular: cat / Plural: cats Singular: child / Plural: children Singular: foot / Plural: feet
Are is plural. "Is" is singular. For example, "There is a glove on the chair". That is singular. "There are gloves on the chair". That is plural.
"Has" is singular, e.g. He has, she has. "Have" is plural, e.g. They have, we have. The exception is "I" - e.g. I have.
One alveolus is a singular, tiny air sac of the lung, surrounded by a network of capillaries, and through which oxygen and carbon dioxide are exchanged. A cluster of such air sacs are alveoli (plural of alveolus).
The word team is singular; the plural form is teams.
Who may be singular or plural.
This is singular. These is the plural form.