הסביבה כאן נקייה.

• הסביבה = the environment / the surroundings
• כאן = here
• נקייה = clean (feminine singular)

So the sentence is literally the environment here clean, which in natural English becomes The environment here is clean.

The prefix ה־ is the Hebrew definite article, meaning the.

• סביבה = environment / surroundings
• הסביבה = the environment / the surroundings

Hebrew usually attaches the directly to the beginning of the noun instead of writing it as a separate word.

In Hebrew, the verb to be is usually omitted in the present tense.

So instead of saying something like The environment here is clean with a separate word for is, Hebrew simply says:

• הסביבה כאן נקייה
  literally: the environment here clean

This is completely normal Hebrew.
In the past or future, Hebrew does use forms of to be when needed.

Because הסביבה is a feminine singular noun, the adjective must agree with it.

In Hebrew, adjectives match the noun in:

• gender
• number
• often definiteness in some constructions

Here:

• סביבה is feminine singular
• so clean must also be feminine singular: נקייה

Compare:

• masculine singular: נקי
• feminine singular: נקייה

It is pronounced roughly ne-kee-YA.

A simple transliteration is nekiyá.

Stress falls on the last syllable:

• ne
• ki
• YA

The ending ־ייה helps produce that -iya sound.

The י helps represent the sound pattern of the feminine form here.

The masculine adjective is:

• נקי = clean

When you make it feminine singular, it becomes:

• נקייה

So this is not a random extra letter; it is part of how this adjective is spelled in the feminine form.

A useful pattern to notice:

• נקי → masculine
• נקייה → feminine

Yes. סביבה can refer to:

• the environment in a general sense
• the surroundings
• the area around someone or something

So depending on context, הסביבה כאן נקייה could mean:

• The environment here is clean
• The surroundings here are clean

If no extra context is given, both are possible.

Hebrew word order is somewhat flexible. Here, כאן sits between the noun and the adjective:

• הסביבה כאן נקייה

This is a very natural way to say The environment here is clean.

You may also hear other orders, depending on emphasis, such as:

• כאן הסביבה נקייה = Here, the environment is clean
• הסביבה נקייה כאן = less neutral, more marked depending on context

So the given order is normal and neutral.

Yes. Both כאן and פה can mean here.

• כאן is often felt to be a bit more neutral or slightly more formal
• פה is very common in everyday speech

So you could also say:

• הסביבה פה נקייה

That would mean essentially the same thing.

It is an adjective meaning clean.

The sentence is a nominal sentence in the present tense:

• noun: הסביבה
• adverb of place: כאן
• adjective: נקייה

So Hebrew is not using a present-tense verb here. It is simply describing the noun:

• the environment
  • here
    • clean