Science and Technology Minister Jitendra Singh said that India is using steel slag, waste generated during steel production, to build stronger and more durable roads along the India-China border in Arunachal Pradesh. Slag is made up of impurities melted out of ore during the steel-making process in most steel plants. This technology facilitates large-scale utilisation of waste steel slag of steel plants and has proved very useful in effective disposal of about 19 million tonne per annum of steel slag generated in the country, which is expected to reach 60 million tonne by 2030. As per an official statement, India is the world's second largest steel producer and around 200 kg of slag is generated per ton of steel production. This technique has been successfully tested in road construction in four major states of the country including Gujarat, Jharkhand, Maharashtra and Arunachal Pradesh. He added that steel slag roads not only cost about 30 per cent lesser than conventional paving, but are also more durable and resistant to vagaries of weather. Council of Scientific & Industrial Research (CSIR) - Central Road Research Institute (CRRI) developed the technology to use steel slag for road construction, which is set to address the problem of slag generated by steel plants. The Union minister said that last year Surat [Gujarat] was the first city in the country to get a processed steel slag road built as part of a joint-venture of CSIR-CRRI, Union Ministry of Steel, NITI Aayog and Arcelor-Mittal Nippon Steel at Hazira. In this context, as per a PIB report, Union Minister of State for Steel Faggan Singh Kulaste, while participating in an industry meet organised under the 'One Week One Lab' programme of CSIR - CRRI, said the Steel Slag Road technology of CSIR-CRRI is playing an important role in realising the Prime Minister Narendra Modi’s mission of ‘Waste to Wealth’. Due to non-availability of efficient disposal methods of steel slag, huge piles of steel slag have come up around the steel plants, which have become a major source of water, air and land pollution. The first road made with steel slag road technology in Surat, Gujarat, has become famous for its technological excellence at the national and international level. Similarly, the National Highways Authority of India (NHAI) has also successfully used this technology in road construction on National Highway-66 (Mumbai-Goa), under the technical guidance of CRRI.