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The Premixed Charge Compression Ignition (PCCI) natural-gas engine has been investigated extensively as a power source for stationary applications due to its potential for high thermal efficiency and very low NOx emissions. However, methane, which is a major component of natural gas, has a high auto-ignition temperature. Stable ignition of natural gas in PCCI engines can be achieved by high compression ratio, intake air heating, internal EGR and various other techniques. Although each of the above-mentioned methods shows positive effects, to some extent, on engine performance and emissions, the literature indicates that stable operation of the PCCI natural gas engine would require a combination of various techniques, which reveals the need for further investigation. The goal of the present study is to control the PCCI natural gas ignition and combustion by ozone addition into the intake air.