On 20 October 2026, the ecology and environment, public security and transport bureaus of Fengdu County, Chongqing, jointly issued a work plan optimising restrictions on high-emission diesel trucks in the county’s urban area, published on 23 October. Built on the Chongqing air pollution regulations, the plan consolidates two measures: China-III and older diesel trucks are barred from the built-up area around the clock, and China-IV diesel trucks are barred from 7:00 to 22:00 daily. It also schedules signage, enforcement against violations, and promotion of scrappage subsidies for China-III and IV trucks.
The difference: this time China-IV is included
Recent local controls on high-emission diesel trucks have mostly stopped at banning China-III around the clock — Baicheng, Zhongshan and Qingyuan all follow that pattern. Fengdu’s plan goes further by putting China-IV trucks under a daytime ban, compressing the operating window of a fleet segment that is still very much on the road to eight night-time hours. Second-hand vehicles meeting in-use emission and safety standards can still be transferred in, except those the state requires or encourages to retire.
What it means for AIFILTECH customers
The daytime ban on China-IV trucks is a warning worth heeding: policy is moving from retiring China-III to squeezing China-IV, and no retrofit changes a vehicle’s registered emission stage — a purifier does not buy back daytime access, and any proposal should say so before money is spent. The real retrofit value for China-IV trucks lies in passing emissions inspections: tighter daytime windows push fleets to run more night shifts, and cold starts, low speeds and constant stop-start duty are exactly where DPFs under-regenerate and black smoke appears. Regular cleaning and inspection keep retest risk down, and washable, regenerable hardware such as the AIFILTECH metal black smoke purifier pays off most in fleets running harder. More fundamentally, shrinking restrictions mean the residual-value window on China-IV assets is closing — budget the switch to China-V, VI or new-energy trucks ahead of the next notice, not after it takes effect.
Prepared by AIFILTECH from the published plan; the official Fengdu County text governs the scope of the restrictions.
