With the start of the new school semester in September, motorcycle use among students increases, bringing another peak period for motorcycle emissions inspections. Taipei's Department of Environmental Protection said about 381,000 motorcycles registered in Taipei were due for inspection as of August, with 91.97% already inspected. About 31,000 motorcycles have yet to complete the required inspection.

Under Taiwan's Air Pollution Control Act, motorcycles with valid license status that have been manufactured for five years or more must undergo an annual emissions inspection. The inspection period falls within one month before or after the month shown on the vehicle registration. Motorcycles that miss the deadline may be fined NT$500. If the inspection remains incomplete six months after the deadline despite a required improvement notice, the fine may rise to NT$3,000, and continued noncompliance may eventually result in license cancellation.

The department reminded motorcycle owners that emissions inspections are a legal obligation. Inspection notices are provided as a reminder service, and failure to receive a notice does not exempt owners from the requirement. Taipei-registered motorcycle owners can use the city's official LINE account “定檢好康愛報報” or the Ministry of Environment's “環境即時通” app to receive inspection reminders.

Motorcycles that have not completed their annual emissions inspection are also prohibited from entering Taipei's designated air quality maintenance zones, with violators subject to a NT$500 fine. Taipei currently has 13 high-traffic areas, six major urban roads and a demonstration zone in Da'an District designated as air quality maintenance zones.