The National Highways Authority of India (NHAI) on Monday released the first National Highways Green Cover Index (NH-GCI), establishing a baseline for measuring vegetation along the country’s highway network using satellite-based assessment.. The first assessment cycle has covered around 30,000 kilometres of national highways across 24 states. (Image sourced from Doordarshan). Subsequent annual cycles will track year-on-year changes along the same highway stretches, enabling monitoring of improvements in roadside vegetation over time, NHAI said in a statement.. The index was prepared in coordination with the National Remote Sensing Centre (NRSC) of the Indian Space Research Organisation (ISRO) after a memorandum of understanding was signed by both agencies in January 2024 to develop a scientific and quantitative framework for assessing plantations along national highways.. The index uses high-resolution satellite sensors to detect chlorophyll content along highway corridors, enabling an estimate of vegetation within the right of way on both sides of the road.. The first assessment cycle has covered around 30,000 kilometres of national highways across 24 states for the period between July and December 2024.. Also Read: NHAI to build bridge, 2 km road to ease traffic at Masani Barrage. According to NHAI, the index is a technology-based approach for macro-level estimation of green cover along highways and could help identify stretches with relatively lower vegetation levels where plantation management may require attention. The framework also enables comparison and ranking of highway sections based on green cover. It said the use of satellite data offers a cost-effective and time-efficient method for monitoring vegetation along the expanding national highway network.. The release of the NH-GCI report follows NHAI’s publication of its sustainability report in July 2025, which outlined the agency’s sustainability initiatives and environmental performance across highway development and operations site.