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The Amazon Tall Tower Observatory or ATTO is a scientific research facility in the Amazon rainforest of Brazil. This includes a 325-metre-tall (1,066 ft) tower that extends far above the forest canopy and two 80-metre (260 ft) towers that allow researchers to collect samples from the soil surface to above the forest canopy. Additionally, there are climate-controlled containers for laboratory equipment and an office, a base camp and nearby sites for studying vegetation and soil processes. The tall research tower is one metre taller than the Eiffel Tower and is currently the tallest structure in South America. All towers are equipped with a broad range of instruments to measure chemical and physical properties of the atmosphere, such as greenhouse gas concentrations, aerosols and meteorological data.

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