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The team says it's massively scalable, capable of operating either at industrial scale, or in extremely small on-site operations. "They can be as small as a thick iPad," says MacFarlane, "and that could make a small amount of ammonia continuously to run a commercial greenhouse or hydroponics setup, for example.", from the article.

There would still be a source of nitrogen needed for small scale on-site ammonia production. How small can air separation units get?