India finalizes Stage IV and V emission standards for nonroad engines

9 April 2018

Indian Ministry of Road Transport and Highways (MoRTH) published last month the final Bharat Stage (CEV/Trem) IV/V emission standards for nonroad diesel engines used in construction and agricultural equipment. The BS (CEV/Trem) IV emission standards are aligned with EU Stage IV standards, while the BS (CEV/Trem) V standards are aligned with EU Stage V.

The BS IV emission standards become effective from October 2020, while the implementation of BS V standards starts in April 2024. The stage BS V standards include a diesel particulate filter (DPF) forcing particle number standard for engines with rated power between 19 and 560 kW.

The BS IV/V regulations include no BS IV emission standards for diesel engines with rated power below 37 kW—a category that includes some 90% of agricultural tractors in India—or for engines above 560 kW, but the BS V standards cover all power ratings.

Engines equipped with SCR must meet an ammonia emission limit of 25 ppm for engines ≤ 56 kW and 10 ppm for engines above 56 kW. The limits are defined as a mean value over the NRTC and NRSC cycles.

The regulation includes a six month grace period when registrations of equipment complying with the previous set of emission standards is allowed. From April 2026, an in-service conformity check is required for all BS V approved engines manufactured.

India becomes the first country outside of the European Union to enact DPF-forcing nonroad engine emission standards based on EU Stage V—ahead of other emerging market countries and also ahead of the United States and Japan. The current US Tier 4 nonroad standards, aligned with EU Stage IV, can be met without a DPF and some 50% of engine families certified to Tier 4 standards have no particulate filters.

Source: MoRTH