Further notes on the calculation tool

The transport calculations

The transport calculations allow you to estimate the emissions from your fleet, other business travel and staff commuting. The data needed for each calculation tier is indicated in the table below:

Using the Tier 1 method you can estimate air pollution emissions (NO_x, PM₁₀ and PM_2.5) from exhaust tailpipe from non-electric vehicles as tailpipe emissions for electric vehicles are zero. The tool does not estimate emissions associated with charging electric vehicles or plug-in hybrids. This method can be used for your own, leased or hired vehicles, staff, or other business travel.              
Using the Tier 2 method you can estimate air pollution emissions (NO_x, PM₁₀ and PM_2.5) from exhaust tailpipe and non-exhaust sources (tyre, brake wear and road abrasion) from electric, hybrids and conventional vehicles. This method can be used for your own, leased or hired vehicles. The tool does not estimate emissions associated with charging electric vehicles or plug-in hybrids.              
If the user is aware of their vehicle registration date, then the table below could be used to determine their Euro standard per vehicle type. Otherwise, vehicle information (i.e. the date of first registration) could be found from the DVLA website. If the Euro status in the DVLA website is shown as Euro 6AJ, 6AK, 6AL, 6AM, 6AN, 6AO, 6AP, 6AQ or 6AR, the vehicle meets the Euro 6d standards.

The heat and power calculations

This element of the tool will estimate air pollutants emissions from combustion of fuels in fixed stationary plants, which are typically associated with generating heat and power. Emissions from stationary combustion devices are dependent on the fuel being burnt, as well as the type of device.

The tool allows emissions to be generated using a Tier 1 method – only taking account of the fuels being burnt – or using a Tier 2 method, which accounts for both the different types of fuel and a very simple categorisation of device types.

The data needed for each calculation tier is indicated in the table below:

The NRMM calculations

For NRMM (non-road mobile machinery)/off-road machinery, activity data are usually expressed in terms of energy output (kWh), but emission factors can also be derived that apply to fuel totals as well as the activity data. Companies are more likely to hold records of fuel purchases, than energy output. However, energy data may be estimated from vehicle odometer readings or deployment schedules and load factor estimates.

The Tier 1 methodology will require the basic fuel use or operational data from NRMM. This calculation does not require any information about the equipment that consumes the fuel, the tool simply uses some sectors' average factors - such as average equipment types, fleet, age, engine size, etc. to estimate the activity data and emission factors and calculate the emissions.

The Tier 2 methodology will require more details on the NRMM equipment using the fuel. In this case emissions are calculated from a bottom-up approach using machinery- or engine-specific emission factors in g/kWh based on the power and emission standard of the engine and estimates of annual hours of use, and load factors of each type of machinery operated by the company.

The data needed for each calculation tier is indicated in the table below: