Terracotta Warriors cry out for clean air (2)

The Emperor Qin Shihuang's Mausoleum Site Museum has been monitoring the environment in the pits since the 1980s, and has published successive measures for environmental control, including improving museum greening, adapting windows for proper lighting and banning vehicles from its gardens.

A team of scientists is also studying the influence of particulate matter on the Terracotta Warriors.

Zhou Tie, chief engineer of the Emperor Qin's Terracotta Warriors and Horses Museum, said environmental control at the museum must be further strengthened.

"Air curtain technology, which is a kind of modern science and technology, has found a good application in other fields. Applying this technology in the museum is a good idea, which can effectively isolate the outside contaminants from the heritage items inside," Zhou said.

However, Zhou said, as there is no successful precedent applying the system to a site museum - which involves water, earth and air in multiple fields with many environmental factors - the technology still needs long-term experimentation.

Air curtains have been used in museums outside China to fix the indoor environment, instead of preserving relics.

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