1 Subjects: “...exhaust gas emission...”

2 Subjects: “...exhaust gas recirculation...”

3 Subjects: “...exhaust emissions and spark-ignition engine...”

4 Subjects: “...power plant exhaust gas...”

5 Subjects: “...emission...”

6 Subjects: “...greenhouse gas emissions...”

7 Subjects: “...exhaust emissions...”

8 Subjects: “...gas diffusion layer...”