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If you mean one random plant in a plot of other onion plants then the is no.

It may indicate a problem with that one plant, but if there is air or soil pollution it will affect all the plants.

Actually, this may be true. Acid rain contains sulfur dioxide (SO2) which is used by onions to develop their infamous sulfur compounds that make you cry. Normally the source of it is from dying animals - decomposers that break down organic material and produce sulfur compounds. The onions take the sulfur and make propanethiol S-oxide, which combines with other enzymes and eventually the water in your tear ducts to produce sulfuric acid. Onions may grow "randomly" in an area due to a certain amount of acid rain, though this would be highly dependent on how much of it there is. Too much would cause an imbalance in the pH of the soil, preventing any plant from taking root.

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