CO₂ emissions by sector in Spain: who pollutes the most and why in 2026

Transport continues to be the main contributor to greenhouse gas emissions, followed by industry and the agricultural sector, while electrification is emerging as the main way to accelerate decarbonisation.

CO₂ emissions by sector in Spain: who pollutes the most and why in 2026. According to the data collected, the transport sector remains the largest emitter of greenhouse gases in Spain, accounting for a significant proportion of the country’s total emissions. This sector includes a variety of activities, from road and rail transport to air and sea transport, all of which contribute substantially to the country’s carbon footprint. The dependence on fossil fuels, especially petrol and diesel, in motor vehicles, together with the increase in mobility and the growth of the vehicle fleet, have meant that transport remains a major challenge in the fight against climate change in Spain.

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