This paper presents nitrogen oxide analysis in modified diesel engine to get homogenous charge compression ignition (HCCI) combustion. In effected of fuel blending value used in testing, a nitrogen oxide measured at started of change of fuel using switch changing fuel.Using 70% palm oil biodiesel and 30% RON 97. At first of absorption of NOx, measurement using Automobile gas analyser. 30 sample of experiment to measure HCCI combustion emission.The experimental results indicate that the maximum NOx release, minimum NOx releaseand average NOx release of 70% palm oil biodiesel and 30% RON 97in HCCI combustion significantly increase from test 1 to test 3. The NOx showed HCCI combustion with intake air boost are far lower than diesel engine. Specifically, the NOx emissions can be maintained within 100 ppm, and the soot emissions are below 30 %at the full load ranges.

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