It is false that a complicated emissions control system would be the only way to lower a rotary engines poor emissions.
Emission control system is developed to reduce emissions and discharge.
They are found in vehicles and other automobile to limit the discharge or release of gases thay are noxious which emit from combustion engine.
To control exhaust emissions, the air-injection system can be used and also, the exhaust gas recirculation (EGR) system can be used to reduce emissions. A high emissions requires high energy control system.
Therefore, It is false that a complicated emissions control system would be the only way to lower a rotary engines poor emissions
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