I have tried that and it helps a little - with a few symptoms - but does not make a huge difference.

I have found this: When they spray, the symptoms that I have come on very quickly. The symptoms that I get depend on what they are spraying as I have detected 4 different odors/tastes in the air associated with spraying:

Salty/metallic - Used to be the most common substance. Now, only usually sprayed during the daytime.

Harsh Chemical - This is a new addition that I've only begun tasting/smelling while spraying during the past 6 months or so. Normally sprayed after dark.

Pharmaceutical - Tastes like a sleeping pill and I have noticed that people get very tired/sleepy when I sense this (including me).

Sulfur - This is more subtle and has only mild symptoms associated with it.

This activity needs to be stopped.