The M4 Metro is not only a symbol of technological excellence and design quality but an infrastructure that improves Milan’s environmental sustainability, with significant benefits for the mobility of Lombard’s capital. The "Blue" line is able to transport 86 million people every year, avoiding more than 180,000 car journeys every day. The new metro line allows a reduction of the city's traffic with a reduction in CO2 emissions of up to 75,000 tonnes per year.

The new line significantly impact environmental protection, helping to make Milan an even greener city. The sustainable construction sites on the "Blue Line" were designed to allow the conservation of 169 trees, while also reducing felling by 24% compared to the initial design ideas. Not only that, the Municipality of Milan planted 1,900 new trees along the line, connecting the many green areas on the M4 Metro route, from Forlanini Park to the Idroscalo, to Parco delle Risaie.

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