The silent death of Persepolis and Biston due to the emission of nitrogen compounds from petrochemical companies

Ilana wrote: The destruction of the inscriptions of the two international sites of Takht Jamshid and Bistun due to the activities of the Marodasht and Kermanshah petrochemical companies and the emission of gases with nitrogen compounds, while in these years a serious measure has been taken to assess the environmental risks of the two petrochemical complexes in the vicinity of the international sites of Takht Jamshid.  And Biston has not been done and continuous and comprehensive scientific research has not been done to estimate the impact of NOx gases caused by the activity of these two industrial units and to prevent their effects on the increasing growth of lichens and the intensification of biological degradation.