Question: Once or twice a day, Ms.
It does not happen as frequently as one would like.

Answer: it is not possible to tell

Question: In the case of fine particles, atmospheric chemical relationships suggest that when only reducing sulfate for example, it is replaced in the atmosphere by nitrate.
It takes a lot of energy for the atmosphere to replacement nitrate.

Answer: it is not possible to tell

Question: I considered this.
I gave it some thought.

Answer:
yes