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Unfortunately eco driving can have detrimental effects on some emissions equipment. The 1985-87 Mercedes California emissions diesels had a DPF that would plug up if the cars were not driven hard enough to keep the DPF hot enough to prevent plugging. In fact a shop manual page I got a hold of described the regeneration procedure "Place the car on a dynamometer at 4000 rpm for 20 minutes". On my car that would be the equivalent of driving it over 90mph. So any trip that does not sustain highway driving conditions for an extended period will plug the DPF. A plugged DPF increases emissions.
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