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Hyderabad's growing metro network has now become one of the largest in India and highlights how urban rail systems can help reduce pollution and control harmful emissions in fast-developing cities. Along with examples from other countries, Hyderabad's metro highlights the important role public transport can play in making cities cleaner and more sustainable.
Hyderabad Metro
These observations are part of a study titled "Golden Decade of Infrastructure Development in India with Special Reference to Metro Rail Network", conducted by the Economic Advisory Council to the Prime Minister. The study states that Hyderabad currently has the fifth-largest operational metro network in the country, covering 69 kilometres. This expansion is discussed in the report as a key example of how metro rail systems can benefit the environment.
How has Hyderabad Metro Reduced Pollution?
The report explains that metro rail reduces air pollution by decreasing the number of private vehicles on roads. Fewer cars and buses mean lower fuel consumption and reduced emissions. To support this, the study refers to research on the Delhi Metro during its early years. That research showed a 34% drop in carbon monoxide levels at a busy traffic junction, proving that metro services can directly reduce pollution from road traffic.
The study also places these findings in a global context. According to the World Bank, urban areas are responsible for over 70% of global carbon dioxide emissions. Experts believe that investing in low-carbon public transport, such as metro rail, is one of the most effective ways to tackle pollution, especially in rapidly urbanising developing countries. Research reviewed in the report shows that metro systems bring major improvements in air quality, particularly in cities that already suffer from high pollution levels.
Estimates suggest that introducing a subway system can reduce particulate matter by around 4% in areas near city centres. World Bank research from 2024 found that among 192 cities worldwide with metro systems, carbon dioxide emissions dropped by nearly 50% within those urban areas. Overall, this led to an 11% reduction in global CO₂ emissions. Similar results were seen in Taipei, where the metro launch reduced carbon monoxide levels by 5-15%, mainly by cutting vehicle use.
