I prolly should directly ask the group here: Is wild mustard pollen an allergen similar to Ragweed pollen?
According to these people, who are selling allergy relief, some people are allergic to Wild Mustard pollen. You can also be allergic to regular Mustard! Who knew? Not me, LOL!
https://getcurex.com/allergens-and-symptoms/allergy-symptoms-immunotherapy-wild-mustard
Page down on their page for specifics; I couldn’t C&P for some reason.