Having overheated your Honda Accord engine during the smog inspection would have most definitely increased NOx emissions. Since you've fixed the RPM speed issue we recommend having a second smog test administered. NOx emission should be lower if your Honda Accord no longer has an overheating problem; hopefully low enough to pass the smog test. If NOx is still high, we recommend inspecting your Honda's EGR valve, and also fuel control for a possible lean fuel condition.
What causes high NOx?