În cazul în care emisiile sunt mari, măsurăm noxele.

În cazul în care means in the event that, in case, or simply if in a more formal style. In this sentence, it introduces a condition.

Yes, it is similar to dacă, but În cazul în care sounds more formal, technical, or administrative. Compare:

• Dacă emisiile sunt mari, măsurăm noxele. = If the emissions are high, we measure the pollutants.
• În cazul în care emisiile sunt mari, măsurăm noxele. = a more formal version of the same idea.

So the difference is mostly one of register, not basic meaning.

The ending -le is the Romanian definite article attached to the noun. Romanian usually puts the at the end of the noun instead of using a separate word like English does.

• emisii = emissions
• emisiile = the emissions

So emisiile sunt mari means the emissions are high/large.

This is a very common Romanian pattern:

• carte = book
• cartea = the book
• case = houses
• casele = the houses

Because mari is the plural form of the adjective mare.

• mare = big / large / high in singular
• mari = plural

Since emisiile is plural, the adjective must also be plural:

• emisia este mare = the emission is high
• emisiile sunt mari = the emissions are high

Romanian adjectives often agree with the noun in number and sometimes gender.

Sunt is the 3rd person plural form of a fi = to be.

Because emisiile is plural, Romanian uses the plural verb:

• emisia este = the emission is
• emisiile sunt = the emissions are

So emisiile sunt mari literally means the emissions are high.

Măsurăm comes from the verb a măsura = to measure.

Here, măsurăm is the 1st person plural present tense:

• eu măsor = I measure
• noi măsurăm = we measure

So măsurăm noxele means we measure the pollutants or we measure the harmful emissions.

The letter ă is a normal part of Romanian spelling and pronunciation; it is not optional.

Noxele comes from noxe, a noun used especially in technical, environmental, and medical contexts. It refers to harmful substances, pollutants, or toxic emissions, depending on context.

• noxe = harmful pollutants / noxious substances
• noxele = the pollutants / the harmful substances

In a sentence about emissions, noxele most naturally refers to polluting or harmful exhaust substances.

This is not a very casual everyday word; it sounds more technical than a general word like poluanți.

Using noxele makes the object definite: the pollutants rather than just pollutants.

• măsurăm noxe would sound less natural in many contexts and more indefinite
• măsurăm noxele suggests specific pollutants being measured, such as the ones produced in that situation

Romanian often uses the definite form in places where English may or may not use the, especially when talking about known or context-specific things.

The comma separates the conditional clause from the main clause.

• În cazul în care emisiile sunt mari = conditional part
• măsurăm noxele = main action

So the structure is: If the emissions are high, we measure the pollutants.

Romanian commonly uses a comma when a subordinate clause comes before the main clause, especially with longer introductory expressions like În cazul în care.

Yes. Romanian word order is fairly flexible, though not completely free. A very natural alternative is:

Măsurăm noxele în cazul în care emisiile sunt mari.

This still means the same thing, but it puts the main action first. The original version sounds slightly more structured and formal because it begins with the condition.

So both are correct:

• În cazul în care emisiile sunt mari, măsurăm noxele.
• Măsurăm noxele în cazul în care emisiile sunt mari.

Literally, mare / mari often means big / large, but in many contexts it is better translated more naturally into English.

With things like emissions, quantities, risks, or numbers, English often prefers high rather than big. So:

• emisiile sunt mari = more naturally the emissions are high not usually the emissions are big

This is a good example of where a direct word-for-word translation is possible, but not the most natural English choice.

It sounds fairly formal, technical, or institutional, mostly because of:

• În cazul în care instead of simpler dacă
• noxele, which is a technical/environmental term

A more everyday version might be:

Dacă emisiile sunt mari, măsurăm poluanții.

or simply:

Dacă emisiile sunt mari, le măsurăm.

So the original sentence is perfectly correct, but it sounds like something from a report, regulation, technical explanation, or environmental procedure.

A rough pronunciation guide is:

în ka-zul în ka-re e-mi-si-i-le sunt ma-ri, mə-su-răm nok-se-le

A few useful notes:

• în has a close central vowel sound that English does not really have
• ă in măsurăm is a short neutral vowel, like the a in sofa
• x in noxe is pronounced like ks
• emisiile has several vowels in a row, but they are pronounced clearly: e-mi-si-i-le

You do not need to pronounce it exactly like this guide, but it can help you break the sentence into parts.