Is there any type of air quality metric?

I ask because in Santiago de Chile, Chile, these type of provisions are not strange in winter because the deterioration could be bigger enough that it is necessary to suspend the use of firewood, the circulation of part of the vehicle fleet and other even more extreme measures. The air simply becomes so bad that vulnerable people and even those who are not can end up in the emergency room for respiratory problems (I only mention immediate damages because there are others in the medium and long term). nostr:note1guqdnqd8umjne4h5swz79fjw9f34uq8wr4gjp0f0udydne8pewpsd49hqv