New Delhi, Sept. 16 -- A new Indo-Italian study has found that Delhi's deteriorating air quality is causing gradual and accelerated damage to the iconic Red Fort, citing the formation of black crusts of pollutants on the red sandstone walls of the 17th-century monument, threatening its structural and aesthetic integrity. The research was published in June this year. Titled "Characterisation of red sandstone and black crust to analyse air pollution impacts on a cultural heritage building: Red Fort, Delhi, India", this study is a comprehensive scientific investigation into the impact of urban air pollution on the monument built by the Mughal emperor Shah Jahan between 1639 and 1648. Analysing air quality data from 2021 to 2023, the researcher...