Proposal to replace para. 9.3.2.8.1. and 9.3.2.9.1. to permit examination and verification of FTIR and QCL-IR analysers by type-approval authorities and designated technical services in addition to metrological institutes, preferably via witnessed testing at the instrument manufacturer’s premises, amend para. 9.3.9.2.2. to permit humidification techniques other than water bubblers and to clarify water concentration requirements for all fuels, and insert new Appendices 10 and 11 setting out a protocol for analyser assessment and a model certificate of acceptable analyser assessment.

Proposal to add abbreviations for Fourier Transform InfraRed (FTIR) and Quantum Cascade Laser mid-InfraRed detection (QCL-IR) analysers, amend the definition of ‘Type of analyser’ to reference ‘Instrument manufacturer’, insert a new definition of ‘Instrument manufacturer’, amend paragraph 4.1.1 to permit use of QCL-IR or FTIR analysers for gaseous components except THC, add detailed specifications for FTIR and QCL-IR analysers including installation requirements and assessment procedures according to CEN EN 17507:2021, amend paragraph 4.3.5 to add interference check procedures for FTIR and QCL-IR analysers, and insert new Annexes 13 and 14 establishing a protocol for analyser assessment and a model certificate of acceptable analyser assessment.

Proposal to insert a new definition of hydrogen ICE vehicle, amend para. 8.2. to establish a two-step verification procedure for trip dynamic conditions, amend para. 9.3.1. to include requirements for hydrogen-fueled tests, amend para. 9.5. to require validation of software tools for trip verification and emissions calculation, amend para. 10.2. to establish a three-step trip validity assessment procedure, amend Figure 6 to illustrate the trip validity assessment procedure, amend para. 10.6. to include gaseous pollutant and particle number emissions during cold start in normal evaluation for hydrogen-fueled tests, amend para. 10.7. to apply separate data-set creation for 3-phase and 4-phase evaluation, amend Table A4/1 to add engine fuel flow as a test parameter, amend Table A5/1 footnote 3 to make PN concentration mandatory for hydrogen ICE vehicles, insert a new row in Table A7/1 for hydrogen stoichiometric coefficient values, amend Annex 8 title and para. 1. to clarify application to non-hydrogen vehicles, and add new Annex 8a establishing a moving averaging window method using distance-specific work for hydrogen ICE vehicles and amend Annex 11 paras. 2., 3.1., and 3.2. to include work ratio calculations applicable to hydrogen-fueled tests.

Proposal to:

• Insert new paragraphs in the introduction to clarify application to vehicles with Automated Driving Systems,
• Add definitions for ADS, ADS road load determination mode, ADS testing mode, and ADS user,
• Amend definitions of mass in running order, powered axle, reference mass, driver user-selectable mode, predominant mode, and configurable start mode to account for vehicles of categories X and Y,
• Amend the On-Board Diagnostic system definition and malfunction indicator definitions,
• Insert footnotes referencing the Consolidated Resolution on the Construction of Vehicles,
• Renumber and amend footnotes regarding Contracting Parties,
• Amend road load family and road load matrix family criteria,
• Amend tables regarding vehicle classifications,
• Amend OBD family definitions,
• Amend reagent warning and reagent inducement system provisions throughout Appendix 6,
• Amend provisions for driver user-selectable modes in Annexes A1 and B6,
• Add special provisions for vehicles of categories X and Y requiring ADS road load determination mode and ADS testing mode in Annexes B4 and B6,
• Amend provisions regarding vehicle operation and testing to reference ADS user in addition to driver,
• Amend provisions in Annexes B8, C3, C4, and C5 to accommodate vehicles equipped with ADS.

The agenda for the Electric Vehicles and the Environment Informal Working Group 98th session scheduled for July 15, 2026, includes presentations on battery performance, discussions on UN GTR 21, UN GTR 22, and UN GTR 25 regulatory topics including minimum performance requirements, state of charge reference, readiness monitor and conditioning cycles, mutual recognition, fuel cell electric vehicles, highly integrated systems, energy throughput, normal usage indices, and battery replacement provisions. UN GTR 25 amendment 2 must be submitted to March 2027 GRPE with a December 2026 deadline.

UN GTR No. 22 on In-vehicle Battery Durability for Electrified Light Duty Vehicles establishes harmonized requirements for monitoring and verifying minimum battery durability performance of pure electric vehicles and off-vehicle charging hybrid electric vehicles of categories M₁ and M₂. Manufacturers must install State-of-Certified Energy (SOCE) and State-of-Certified Range (SOCR) monitors for the vehicle lifetime. Battery energy-based minimum performance requirements specify that vehicles of categories 1-1 and 1-2 must retain 80 per cent SOCE for 5 years or 100,000 km and 70 per cent for 8 years or 160,000 km; category 2 vehicles must retain 75 per cent and 65 per cent respectively. In-use verification comprises Part A verification of monitor accuracy using statistical methods, Part B verification of battery durability through remote data collection, and Part C verification of reported virtual distance. Manufacturers may declare higher performance requirements. Virtual distance may be reported for vehicles with Vehicle-to-Grid functionality or category 2 vehicles used for non-traction purposes.

Proposal to amend UN GTR No. 21 on system power determination:

• Establish a globally harmonized test procedure comparable to traditional engine power ratings for conventional vehicles,
• specify TP1 based on measured electrical power and estimated internal combustion engine power with electrical conversion efficiency factors,
• specify TP2 based on measured torque and speed at axle shafts or wheel hubs with mechanical conversion efficiency factors,
• require manufacturers to provide verifiable K conversion factors,
• remove dynamometer roller measurement options for TP2 in favor of torque and speed sensors or hub dynamometers,
• mandate fuel flow rate measurement for TP1,
• introduce the reference point concept to ensure comparable results across powertrain architectures,
• require five test repetitions with averaging of the last four,
• add applicability guidelines limiting TP1 or TP2 to specific architectures based on power flow characteristics,
• establish approval criteria for system bench facilities as alternatives to chassis or hub dynamometers in a new Annex 3.

UN GTR No. 25 on In-vehicle Battery Durability for Electrified Heavy Duty Vehicles provides harmonised methods to determine battery durability performance of HD-PEVs and HD-OVC-HEVs of categories M₁–M₃ and N₁–N₃ exceeding 3,855 kg MPLM. The regulation requires manufacturers to install State of Certified Energy (SOCE) monitors throughout vehicle lifetime. In-use verification consists of Part A verification of monitor accuracy through measured UBE testing using Methods 1a, 1b, Method 2 (bidirectional power supply), or an alternative HDV chassis dynamometer method, with statistical pass/fail criteria. Part B verification assesses battery durability against optional Minimum Performance Requirements (MPRs) through remote SOCE data collection from sample vehicles. Part C verification, reserved for future amendment, will address reported virtual distance accuracy for V2X, PTO and non-traction purpose applications. Optional Annex 4 specifies MPRs by vehicle category and mass, ranging from 45–70% SOCE retention across specified timeframes and distances. The GTR entered into force with Phase 1 covering core durability assessment and data collection to support future refinement of MPR thresholds based on in-service field data relating to HDVs, referencing WP.29-170-31 and GRPE/2026/3.

Proposal to include testing of vehicles with limited speed. The document sets out the laboratory measurement procedure for brake emissions from light-duty vehicles of categories M₁ and N₁, including vehicles with maximum speed below the Base cycle maximum speed. Testing involves three sections: cooling air adjustment, brake bedding with five repetitions of the WLTP-Brake cycle, and brake emissions measurement with one WLTP-Brake cycle. Brake corner emission families are tested on a component test bench under full-friction braking conditions, measuring PM₁₀ and SPN₁₀ emissions. Compliance is demonstrated using brake corner emissions family parents. Conformity of production requires monthly sampling and testing of brake components, with results evaluated using statistical decision charts through 31 December 2029 for PM₁₀ and thereafter for both PM₁₀ and SPN₁₀.

Proposal to modify UN GTR No. 24 with respect to laboratory measurement procedures for brake emissions of light-duty vehicles. This amendment improves and corrects the testing procedure, including detailed requirements for test system setup, cooling air conditioning, brake dynamometer specifications, WLTP-Brake cycle execution, emissions measurements for particulate matter (PM2.5, PM10) and particle number (TPN10, SPN10), calibration protocols, and reporting of results. The regulation defines brake corner emissions families, friction braking share coefficients for different vehicle electrification types (ICE, HEV categories, PEV), and test procedures using fully-enclosed brake dynamometers with isokinetic sampling systems. A version with tracked changes is available.

Proposal to

• Amend para. 1. to revise scope and application for vehicles of categories M₁, M₂, and N₁,
• Insert footnote 1 to para. 1.,
• Amend para. 3.3. to add driver specification,
• Amend para. 3.3.3. to define “Mass in running order” and exclude driver mass for vehicles of categories X and Y,
• Amend para. 3.3.5. to define “Odometer” with reference to ADS,
• Amend note a of Figure 3 to exclude driver mass for vehicles of categories X and Y,
• Renumber footnote 1 to footnote 2 in para. 5.4.1. and amend it,
• Amend para. 8.3.1. to specify vehicle condition requirements including mode testing and normal driving verification,
• Insert new para. 9.3.5. establishing special provisions for ADS-equipped vehicles of categories X and Y and other categories,
• Amend Annex 1 Part 2 para. 12.10. to reference user-selectable modes and emissions,
• Amend Annex 1 explanatory note (h) to specify driver mass assessment at 75 kg,
• Amend Annex 4 Table A4/1 row 21. to identify acceleration demand sensor or ECU.

Proposal to amend para. 6.1.10. to address division by zero cases when an OVC-HEV consumes zero fuel under charge-depleting conditions by applying good engineering judgement, and amend Annex B8, para. 4.2.2. to modify the charge-depleting fuel efficiency calculation formula for OVC-HEVs and OVC-FCHVs under Level 1B, incorporating treatment of zero fuel consumption cases. The amendments prevent invalid calculations and ensure robustness of WLTP-based methods, addressing limitations in exhaust gas analysis equipment that cause cycle “n” to contain mixed Charge Depleting and Charge Sustaining operation.

Proposal to amend para. 6.1.10. to address division by zero in formulas when an OVC-HEV consumes zero fuel under charge-depleting conditions, and amend Annex B8, para. 4.2.2. to modify the charge-depleting fuel efficiency FECD calculation formula for OVC-HEVs and OVC-FCHVs under Level 1B and 3-phase WLTP testing in Level 2. The amendment applies good engineering judgement optionally to add a dash rather than zero when data input justifiably leads to division by zero.

Proposal to amend para. 4.1. of Appendix 5 to refer to the engine-relevant control unit, amend para. 5.3. to specify that lifetime counter values may be reset only for vehicles whose engine-relevant control unit memory cannot preserve data when unpowered, and amend para. 5.4. to allow counter reset in cases of malfunctioning or engine-relevant control unit replacement. Changes reflect that OBFCM calculation is done in different control units within the vehicle, including battery management for pure electric vehicles.

Proposal to amend para. 6.1.3. of Annex B10 to modify the low temperature pure electric range ratio calculation by allowing the existing PERWLTC,ave value of the representative 23°C interpolation family to be used where multiple low temperature range families belong to the same 23°C family, to avoid additional testing burden while preserving the application of a worst case approach for HVAC systems.

The 74th EPPR Informal Working Group Meeting on Environmental and Propulsion Performance Requirements of L-category vehicles was held on 8 July 2026. Discussion focused on transposing UN-GTR No. 2 into UN Regulation 40, with the group agreeing to establish a Task Force for Euro 4 transposition and setting 21 August as the deadline for supplementary questionnaire information and Task Force feedback. The group continued information exchange on maximum power determination, battery electric vehicle range standardization using SAE J2982 procedures, and deterioration factors in GTR 23 on durability, with no new updates or conclusions reached on next steps for these agenda items.

Proposal to establish a new UN Regulation transposing UN GTR No. 24 into uniform provisions concerning approval of non-original and identical replacement brake parts (brake pads, drum brake linings, brake discs, and brake drums) with regards to particle emissions. The regulation applies to vehicles of category M₁, N₁, and N₂ between 3.5 and 5 tonnes maximum mass. Replacement brake parts must comply with particle emission limits, with emission factors calculated using test wheel load and friction braking share coefficient for the brake emissions family parent. Approval marks must be affixed to approved parts, and conformity of production shall be verified through sampling and testing procedures.

The A-LCA IWG will not submit a Mutual Resolution for adoption at the October 2026 GRPE session; instead, a status report will be presented to GRPE. Work towards completion of the methodology should continue and a revision of the Terms of Reference will be prepared. After the 95th GRPE session in October, an Information/Technical Exchange phase will start with continuation of technical meetings at reduced frequency and organisation of dedicated technical sessions only when required. Due to scaling back of A-LCA’s activities, SG2 activities will be suspended from October.

The agenda includes discussion of the status of the 2026 workplan (TA-51-03), UTAC tyre abrasion timeline Gantt chart (TA-51-02), development of mileage potential metric and tread depth measurement prescription (TA-51-5), test method development status, preparation of TFTA status report for GRBP 84th session (TA-51-04), and next meeting(s).

Current work involves data-collection preparations for TAPP data assessment using an updated template. Some testing has already begun.

Proposal to establish a new supplement to UN Regulation No. 179, improving and correcting brake emissions measurement procedures for light-duty vehicles of categories M₁ and N₁. The regulation applies full-friction braking testing on brake dynamometers using the WLTP-Brake cycle comprising ten trips and 303 brake deceleration events. Testing includes three sections: cooling air adjustment, brake bedding with five cycle repetitions, and emissions measurement with three cycle repetitions. Compliance is demonstrated by measuring PM10 and SPN10 emissions from brake corner emission family parents, with whole-vehicle emissions calculated using friction braking share coefficients specific to vehicle electrification types. PM10 limits are 3 mg/km for M₁/N₁ vehicles and 5 mg/km for N₁ Class III/N₂ vehicles. Conformity of production requires annual testing of brake corner emission families with statistical evaluation per decision charts through 31 December 2029 (Phase I, PM10 only), with Phase II from 1 January 2030 evaluating both PM10 and SPN10. A version of this document with tracked changes is available.

The Task Force on Tyre Abrasion completed work on the UN Regulation on tyre abrasion for C1 tyres and is launching C2 work. UN R186 on tyre abrasion for C1 tyres was adopted at WP.29’s 199th session in June 2026, with a two-stage implementation approach beginning 30 June 2028. C2 test method development is ongoing with an Informal Document to be submitted to GRBP in February 2027 instead of September 2026. C3 tyres will undergo a brainstorming session in October 2026 before commencing testing.

A two-day brainstorming session will be held in Brussels during October 8-9, 2026. The session aims to address the lack of a concrete test method solution for C3 tyre abrasion by reflecting on innovative test method ideas not bound to existing C1 and C2 approaches, brainstorming phased introduction of tyre abrasion requirements across C3 tyre segments, and optimising resources to reduce testing burden. Day 1 will address C3 market complexities and tyre segmentation across duty cycles; Day 2 will cover methodological ideation, funding and resource allocation, and review of the C2 test campaign before the February 2027 working document.

Updates the year reference to the latest international standard specifications