carbon calculator
Coastal Peak Fitness Active Travel Impact Calculator
See how much greenhouse gas and tyre particulate pollution you avoid by walking, running or cycling instead of jumping in the motor.
What this actually means
This wee section explains the numbers in plain English. Scroll down and it’ll walk you through why active travel matters for carbon, air quality, your health and the wider environment too.
What the calculator is showing you
This calculator estimates how much pollution you avoid creating when you walk, run or cycle instead of driving. The carbon side uses official UK Government greenhouse gas conversion factors for average petrol, diesel and electric vehicles, so the numbers are grounded in current UK reporting data rather than guesswork (Department for Energy Security and Net Zero, 2025a).
It also estimates tyre-related particulate matter, because pollution from road travel is not just about exhaust pipes. Even electric vehicles still create pollution through tyre wear, road wear and brake wear, and those non-exhaust emissions are becoming a bigger share of the total as tailpipe emissions fall (European Environment Agency, 2023; European Environment Agency, 2025).
Why carbon matters
Carbon dioxide is a greenhouse gas. Greenhouse gases trap heat in the atmosphere, which is part of what makes Earth liveable. The trouble is that human activity, especially burning fossil fuels, has pushed greenhouse gas levels far beyond natural balance, which means more heat gets trapped and the planet warms up (NASA, 2024a).
That warming is linked with more intense climate impacts, including heat extremes, changing rainfall, strain on ecosystems and wider pressure on food, water and human wellbeing (NASA, 2024b; NASA, 2026). So when you skip a short car trip and use your own legs or a bike instead, that is not nothing. It is a small, real cut in greenhouse gas emissions.
The bit folk often miss: tyre pollution
A car does not need an exhaust to create harmful pollution. As tyres rub against the road, tiny particles break off and get released into the air. These are part of what is known as particulate matter, often shortened to PM. PM10 refers to particles 10 micrometres or smaller, while PM2.5 refers to even smaller particles 2.5 micrometres or smaller (World Health Organization, 2021; UK Government, 2025).
These particles are now a serious environmental issue, and as vehicle fleets become cleaner at the exhaust, tyre and brake wear become a more important piece of the puzzle rather than less (European Environment Agency, 2025). So active travel does not just cut carbon. It can also help reduce the generation of this nasty fine particulate muck.
What PM10 and PM2.5 do to people
PM10 can get into the airways and lungs. PM2.5 is smaller and more worrying because it can reach deep into the lungs and even pass into the bloodstream (World Health Organization, 2024). That is why PM2.5 is taken so seriously in public health guidance.
Air pollution is linked with respiratory disease, cardiovascular disease, stroke and millions of premature deaths globally (World Health Organization, 2024; World Health Organization, n.d.). Put simply: more particulate pollution in the air means more harm to the body. So replacing short car journeys with active travel can be good for your fitness and also better for the air everyone else is breathing.
What this means for nature and the wider environment
Particulate matter does not just affect people. It can settle onto land and water, affect soils, damage sensitive vegetation and contribute to wider ecosystem stress (US Environmental Protection Agency, 2025a). Air pollution can also affect plants and animals directly and indirectly through changes to habitat quality, water and nutrient balances (US Environmental Protection Agency, 2025b).
That means cleaner travel choices do not just benefit human lungs. They can also help the places we care about: streets, parks, woodland edges, coastal paths, school routes and the wider living environment around us.
References
Department for Energy Security and Net Zero (2025a) Greenhouse gas reporting: conversion factors 2025. Available from: https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2025 [Accessed 15 April 2026].
Department for Energy Security and Net Zero (2025b) 2025 Government greenhouse gas conversion factors for company reporting: Methodology paper. Available from: https://assets.publishing.service.gov.uk/media/6846b0870392ed9b784c0187/2025-GHG-CF-methodology-paper.pdf [Accessed 15 April 2026].
European Environment Agency (2023) EMEP/EEA air pollutant emission inventory guidebook 2023: Road tyre and brake wear. Available from: https://copert.emisia.com/wp-content/uploads/2023/09/1.A.3.b.vi-vii-Road-tyre-and-brake-wear-2023_Sep.pdf [Accessed 15 April 2026].
European Environment Agency (2025) Emissions of air pollutants from transport. Available from: https://www.eea.europa.eu/en/analysis/indicators/emissions-of-air-pollutants-from [Accessed 15 April 2026].
NASA (2024a) The causes of climate change. Available from: https://science.nasa.gov/climate-change/causes/ [Accessed 15 April 2026].
NASA (2024b) The effects of climate change. Available from: https://science.nasa.gov/climate-change/effects/ [Accessed 15 April 2026].
NASA (2026) Climate change. Available from: https://science.nasa.gov/climate-change/ [Accessed 15 April 2026].
UK Government (2025) Concentrations of particulate matter (PM10 and PM2.5). Available from: https://www.gov.uk/government/statistics/air-quality-statistics/concentrations-of-particulate-matter-pm10-and-pm25 [Accessed 15 April 2026].
US Environmental Protection Agency (2025a) Health and environmental effects of particulate matter (PM). Available from: https://www.epa.gov/pm-pollution/health-and-environmental-effects-particulate-matter-pm [Accessed 15 April 2026].
US Environmental Protection Agency (2025b) Air, animals and plants. Available from: https://www.epa.gov/air-quality/air-animals-and-plants [Accessed 15 April 2026].
World Health Organization (2021) WHO global air quality guidelines: particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. Available from: https://www.who.int/publications/i/item/9789240034228 [Accessed 15 April 2026].
World Health Organization (2024) Ambient (outdoor) air pollution. Available from: https://www.who.int/news-room/fact-sheets/detail/ambient-%28outdoor%29-air-quality-and-health [Accessed 15 April 2026].
World Health Organization (n.d.) Health impacts: types of pollutants. Available from: https://www.who.int/teams/environment-climate-change-and-health/air-quality-and-health/health-impacts/types-of-pollutants [Accessed 15 April 2026].
What this actually means
This wee section explains the numbers in plain English. Scroll down and it’ll walk you through why active travel matters for carbon, air quality, your health and the wider environment too.
What the calculator is showing you
This calculator estimates how much pollution you avoid creating when you walk, run or cycle instead of driving. The carbon side uses official UK Government greenhouse gas conversion factors for average petrol, diesel and electric vehicles, so the numbers are grounded in current UK reporting data rather than guesswork (Department for Energy Security and Net Zero, 2025a).
It also estimates tyre-related particulate matter, because pollution from road travel is not just about exhaust pipes. Even electric vehicles still create pollution through tyre wear, road wear and brake wear, and those non-exhaust emissions are becoming a bigger share of the total as tailpipe emissions fall (European Environment Agency, 2023; European Environment Agency, 2025).
Why carbon matters
Carbon dioxide is a greenhouse gas. Greenhouse gases trap heat in the atmosphere, which is part of what makes Earth liveable. The trouble is that human activity, especially burning fossil fuels, has pushed greenhouse gas levels far beyond natural balance, which means more heat gets trapped and the planet warms up (NASA, 2024a).
That warming is linked with more intense climate impacts, including heat extremes, changing rainfall, strain on ecosystems and wider pressure on food, water and human wellbeing (NASA, 2024b; NASA, 2026). So when you skip a short car trip and use your own legs or a bike instead, that is not nothing. It is a small, real cut in greenhouse gas emissions.
The bit folk often miss: tyre pollution
A car does not need an exhaust to create harmful pollution. As tyres rub against the road, tiny particles break off and get released into the air. These are part of what is known as particulate matter, often shortened to PM. PM10 refers to particles 10 micrometres or smaller, while PM2.5 refers to even smaller particles 2.5 micrometres or smaller (World Health Organization, 2021; UK Government, 2025).
These particles are now a serious environmental issue, and as vehicle fleets become cleaner at the exhaust, tyre and brake wear become a more important piece of the puzzle rather than less (European Environment Agency, 2025). So active travel does not just cut carbon. It can also help reduce the generation of this nasty fine particulate muck.
What PM10 and PM2.5 do to people
PM10 can get into the airways and lungs. PM2.5 is smaller and more worrying because it can reach deep into the lungs and even pass into the bloodstream (World Health Organization, 2024). That is why PM2.5 is taken so seriously in public health guidance.
Air pollution is linked with respiratory disease, cardiovascular disease, stroke and millions of premature deaths globally (World Health Organization, 2024; World Health Organization, n.d.). Put simply: more particulate pollution in the air means more harm to the body. So replacing short car journeys with active travel can be good for your fitness and also better for the air everyone else is breathing.
What this means for nature and the wider environment
Particulate matter does not just affect people. It can settle onto land and water, affect soils, damage sensitive vegetation and contribute to wider ecosystem stress (US Environmental Protection Agency, 2025a). Air pollution can also affect plants and animals directly and indirectly through changes to habitat quality, water and nutrient balances (US Environmental Protection Agency, 2025b).
That means cleaner travel choices do not just benefit human lungs. They can also help the places we care about: streets, parks, woodland edges, coastal paths, school routes and the wider living environment around us.
References
Department for Energy Security and Net Zero (2025a) Greenhouse gas reporting: conversion factors 2025. Available from: https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2025 [Accessed 15 April 2026].
Department for Energy Security and Net Zero (2025b) 2025 Government greenhouse gas conversion factors for company reporting: Methodology paper. Available from: https://assets.publishing.service.gov.uk/media/6846b0870392ed9b784c0187/2025-GHG-CF-methodology-paper.pdf [Accessed 15 April 2026].
European Environment Agency (2023) EMEP/EEA air pollutant emission inventory guidebook 2023: Road tyre and brake wear. Available from: https://copert.emisia.com/wp-content/uploads/2023/09/1.A.3.b.vi-vii-Road-tyre-and-brake-wear-2023_Sep.pdf [Accessed 15 April 2026].
European Environment Agency (2025) Emissions of air pollutants from transport. Available from: https://www.eea.europa.eu/en/analysis/indicators/emissions-of-air-pollutants-from [Accessed 15 April 2026].
NASA (2024a) The causes of climate change. Available from: https://science.nasa.gov/climate-change/causes/ [Accessed 15 April 2026].
NASA (2024b) The effects of climate change. Available from: https://science.nasa.gov/climate-change/effects/ [Accessed 15 April 2026].
NASA (2026) Climate change. Available from: https://science.nasa.gov/climate-change/ [Accessed 15 April 2026].
UK Government (2025) Concentrations of particulate matter (PM10 and PM2.5). Available from: https://www.gov.uk/government/statistics/air-quality-statistics/concentrations-of-particulate-matter-pm10-and-pm25 [Accessed 15 April 2026].
US Environmental Protection Agency (2025a) Health and environmental effects of particulate matter (PM). Available from: https://www.epa.gov/pm-pollution/health-and-environmental-effects-particulate-matter-pm [Accessed 15 April 2026].
US Environmental Protection Agency (2025b) Air, animals and plants. Available from: https://www.epa.gov/air-quality/air-animals-and-plants [Accessed 15 April 2026].
World Health Organization (2021) WHO global air quality guidelines: particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. Available from: https://www.who.int/publications/i/item/9789240034228 [Accessed 15 April 2026].
World Health Organization (2024) Ambient (outdoor) air pollution. Available from: https://www.who.int/news-room/fact-sheets/detail/ambient-%28outdoor%29-air-quality-and-health [Accessed 15 April 2026].
World Health Organization (n.d.) Health impacts: types of pollutants. Available from: https://www.who.int/teams/environment-climate-change-and-health/air-quality-and-health/health-impacts/types-of-pollutants [Accessed 15 April 2026].