Circlair is a spin-off of the Surface Chemistry and Catalysis (COK-KAT) research group, which uses innovative air purification technologies to significantly reduce emissions of ammonia, odors, and particulate matter in livestock farming and industry. The company uses an advanced air scrubber that filters contaminated air and converts the captured nitrogen into a high-quality liquid fertilizer substitute. This circular approach supports the energy transition and sustainable agriculture by transforming waste streams into valuable raw materials.