What type of emissions is specified under inspection for regulated engines?

Regulated engines are primarily monitored for emissions of hydrocarbons because these compounds are associated with incomplete combustion of fuel. Hydrocarbons contribute significantly to air pollution, forming smog and affecting air quality and health. This focus aligns with environmental regulations that aim to reduce emissions harmful to the atmosphere and public health.

While particulates, nitrogen dioxide, and aerosols are also important in emissions discussions, hydrocarbons are particularly emphasized due to their direct link to engine performance and efficiency. In inspecting regulated engines, understanding and controlling hydrocarbon emissions is crucial for compliance with environmental standards and reducing overall pollution.