What are emissions?

Emissions are all releases of substances or energy from an installation, material or activity into the air, water or soil. In construction the focus is mainly on greenhouse gases (CO₂, methane), nitrogen oxides (NOx), particulate matter, volatile organic compounds (VOCs) and noise or vibration emissions.

Main emissions in construction

Substance	Source	Effect
CO₂	Cement, steel, heating	Greenhouse gas, climate change
NOx	Diesel engines, combustion	Acidification, smog, nitrogen deposition
Particulate matter (PM10/PM2.5)	Cutting, demolition, transport	Respiratory issues
VOCs	Paint, glue, sealant	Smog, indoor air irritation
Methane (CH₄)	Gas leaks, landfill	25× stronger greenhouse gas than CO₂
Noise and vibration	Pile drivers, machines	Disturbance to neighbours

Emissions across the life cycle

A building emits during each phase:

1. Raw material extraction — limestone, iron ore, sand
2. Material production — particularly cement and steel
3. Transport — to factory and site
4. Construction itself — site traffic, machines, energy use
5. Use (operational) — heating, cooling, electricity
6. Maintenance and renovation — replacement of materials
7. Demolition and waste — incineration, landfill, recycling

How to limit emissions

In design and material choice

• Reuse and bio-based materials (timber, hemp, earth)
• Concrete with lower cement content or low-carbon binders
• Material passport and life-cycle assessment
• Design for disassembly

In execution

• Electric or hydrogen-powered plant
• Short transport routes, full loads
• Dust and noise control on site
• Concentrated site logistics

In use

• High insulation and airtightness
• Heat pump or hybrid system
• PV panels and green power
• Energy-efficient lighting and appliances

Regulations

• Nitrogen / air-quality directives — limit NOx releases
• LCA / EPD requirements — for new build
• EPBD / Building Regulations Part L — energy- and carbon-related requirements
• REACH — restricts hazardous substances

Related terms

• Sustainable building
• Life-cycle assessment
• Near-zero energy building
• Cradle to cradle
• Life cycle
• Circular economy

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