Seemingly happened overnight

[ErnestHemingway]

I check on my plants every day. Yesterday, they were fine, looking green, healthy, and growing. Today I went out and was shocked. They are yellow on the leaves near the base on every single plant. They don't look unhealthy as a whole outside of those areas, but on EVERY plant at EVERY node, they are yellow.
I transplanted them into fresh Fox Farm Ocean Forest last week, and haven't given them any other nutrients than that, but because of how great they looked I didn't think they needed it.
I thought maybe I should hit them with some N and Fe, even though I was kind of shaking my head and finding it suspicious that all of a sudden all plants changed so quickly, and then I noticed some weeds near my plants that had the same thing. In the inner part of the plant, they too were turning yellow.
My plants are near a farm field. Could the farmer have sprayed something to make them do this? Or- this might be super unlikely, but fireworks were going off a couple miles away last night at a local town. Can the pollutants from them effect my plants?
Not all weeds and plants around this area are effected, but definitely more than just my MJ plants are.
HELP

 

[resinryder]

My first guess is nutrient defecient. Feed em. Add some calcium to the feed.
When transplanting into FFOF I always feed. Exception being young seedlings.
No fireworks wouldn't cause that from miles away

 

[paradoxlost]

How moist is the soil

EDIT: nvm I enlarged the pics.

 

[Loc Dog]

Something has been eating your leaves. Have you checked any leaves under a strong microscope? It looks like caterpillars chewing the leaves, but if you have them, could have worse microscopic bugs.