How are emissions tested?

Emissions testing typically involves measuring the pollutants released from a vehicle's exhaust system to ensure compliance with environmental standards. This is often done using specialized equipment that analyzes the concentrations of gases like carbon monoxide, nitrogen oxides, and hydrocarbons during a vehicle's operation. Tests can vary by region but commonly include both tailpipe testing and onboard diagnostics (OBD) assessments. Additionally, some jurisdictions may require periodic inspections to verify that vehicles meet emissions regulations.