I am particularly worried about the criticopnions expressed in the local newspaper concerning the project of building anof the art gallery.

Criticism is usually paired with of, but “opinions” works with about/concerning

Although I am partially agree with the content, the way it was written might lead to misconceptions among citizenship.readers

This general context (civil project) is one in which “citizens” makes sense but here we’re talking about an article so the people who are affected aren't just citizens, but the people who actually read the article

What is more, discouraging them toand lead them to disregard the value and benefit froms of art in general.

First of all, in my humble opinion I would also consider to spend thI believe local, public funds in a more effective way, given the fact that there is, for instance,should be spent more effectively (ie. on basic facilities which need for a betterdesperately require maintenance).

Nonetheless, because these public funds came from the Ministery of Culture, so it is out of question the opinion expressed in the article is _______.

I'm not sure what you mean by “out of the question” so you can fill in the blank with what you're trying to say about the article’s viewpoint

In fact, it just contributes to get on nerves the people of our town, not to mention how this news affectonly upsets the people of our town and degrades the newspaper’s reputation.

“Just” and “getting on one's nerves” are very informal

Secondly, tThe journalist who wrote this article has made serious declarations on behalf of the average citizen, stating that art is worthless for peoplelacks the authority to make such serious declarations - such as “most people aren't interested in art” - on behalf of the average citizen.

this should go before the part about the newspaper upsetting the people of the town

How could one encourage young people to enjoy art at school whereas at the same time the local newspaper public such content, yet publish such content in the local newspaper?

I would recommend reword the article to be in accordance with what it is expected from a journalistThis article should be reworded in accordance with responsible journalistic expectations and practices.

In order to do that it is especially important to search for information in public sources before publishing so as not to innecesarily alarm peopleTo that end, journalists must obtain information from credible sources to avoid spreading misinformation.

I am particularly worried about the criticsism expressed in the local newspaper concerning the project of building an art gallery.

critic = person, criticism = thing

Although I am partially agree with the content, the way it was written might lead to misconceptions among citizenship.

A person is a citizen. A citizen has citizenship. Noun vs adjective

What is more, it discouraginges them tofrom benefiting from art in general.

What is more, discouraging them to benefit from art in general "is sad". The sentence you wrote needs a bit more detail at the end and it would probably be ok - not the best but ok.

First of all, in my humble opinion I would also consider to spending the local public funds in a more effective way, given the fact that there is, for instance, basic facilities which need for a better maintenance.

which need better maintenance or are in need of better maintenance

spending - we use "ing" a lot more than Spanish. Sorry I can't explain the reasoning why in this case but it's definitely spending

Nonetheless, these public funds came from the Ministery of Culture, so it is out of question the opinion expressed in the article is out of the question.

In fact, it just contributes to get onting on the nerves the people of our town, not to mention how this news affects the newspaper’s reputation.

How could one encourage young people to enjoy art at school whereas at the same time the local newspaper publicshes such content?

or "makes public such content"

I would recommend rewording the article to be in accordance with what it is expected from a journalist.

In order to do that it is especially important to search for information in public sources before publishing so as not to iunnecessarily alarm people.