This is the 12274th most frequent Spanish word.
lanzando
"Throwing" or "launching."
In this sentence, 'lanzados' refers to the action of propelling or sending fireworks upwards.
Estamos viendo fuegos artificiales siendo lanzados al cielo.
We are watching fireworks being launched into the sky.
The verb 'lanzando' is used in its gerundive form, indicating an ongoing action of throwing.
Él está lanzando un frisbee en el parque.
He is throwing a frisbee in the park.
Here, 'lanzando' implies initiating or starting something, in this case, a campaign, metaphorically described by the verb.