Green city image in London UK

Cleaning up the air we breathe

Siemens Mobility introduces Clean Air Zones (CAZ)
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Siemens Mobility is cleaning up the air we breathe

According to the World Health Organisation, over four million people die every year from the effect of low air quality, with 75% of pollutants believed to be caused by vehicle emissions.

In the UK, air pollution is one of the most significant environmental risks to human health. Our innovative and highly secure solutions for improving air quality are modular and future-proof and are helping cities around the world to address a range of air quality issues.  Let us help you meet your air quality targets by exploring and implementing our intelligent solutions.  

Contact our experts who have helped to implement UK Clean Air Zones

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Clean Air Zones

Taking the initiative

There are several initiatives already in place to help tackle many of the sources of air pollution - for example, London's Ultra Low Emission Zone (ULEZ). A further five councils across the UK are also set to introduce Clean Air Zones (CAZs) having been identified by a DEFRA study to identify cities in the UK which were likely to miss EU air quality targets by 2020. Such schemes are highly effective in targeted locations to incentivize and/or regulate driver behaviour. Clean Air Zones are part of a broader strategy to improve the air we breathe but also improves the way we move around our cities. Click on the topics below for more information
Clean Air Zones

Find out how our proven technology can help you to reduce air pollution in your area by encouraging the transition to cleaner, lower emission vehicles.

Zephyr Air Quality Sensor

Measure and monitor your network's ambient air quality and integrate into your traffic management applications.


Siemens Mobility has a family of sensors including proven loop, radar and wireless detection solutions that provide accurate data suited to your needs.

Stratos Traffic management

Make meaningful and timely interventions through Siemens Mobility's Stratos traffic management system to implement strategies based on reliable pollution data and prevailing air quality levels. 

Electric vehicle charging infrastructure

Electric vehicle charging technology and services to suit your requirements coupled with our award-winning service and EV charger maintenance division.

The problem with today's cities

Ultra Low Emission Zone (ULEZ)

Siemens Mobility software is at the heart of the ULEZ, integrating with the existing roadside sensors and ANPR cameras which form part of the Transport for London's established congestion charging scheme.

The purpose of the ULEZ is to improve air quality in and around Central London by reducing the number of older, more polluting vehicles that enter the central zone. 


London's Ultra Low Emission Zone (ULEZ) was introduced in 2019 and means that most vehicles must either meet new, tighter exhaust emission standards or pay a daily charge to travel within the zone.  


The system identifies and registers every vehicle that enters the ULEZ - 24 hours a day, 7 days a week and 365 days a year.  This information is then transmitted to a data centre where Siemens Mobility software determines the compliance of the vehicle based on its emissions profile.  

London's ULEZ in detail

Siemens Mobility provided the TfL ULEZ enforcement system in London on a Design, Build, Operate and Maintain basis, covering both the roadside equipment and central IT instation.  A central IT instation service management centre is operated on a 24/7, 365 days a year basis by a dedicated Siemens Mobility team with our maintenance engineers providing local 1st and 2nd line support.  3rd line support is provided by technical experts at Siemens Mobility in Poole, UK.


The system is integrated with the roadside sensors and ANPR cameras which form part of TfL's existing Congestion Charging scheme.  ANPR cameras identify and register every vehicle that enters the ULEZ - 24 hours a day, 365 days a year.  This information is then transmitted to a dedicated and secure Siemens Mobility data centre, where our ULEZ instation software determines the compliance of the vehicle.


The system can process an immense volume of data, which has to be processed and stored in such a way it can be used as a basis for notifications of charges and penalties.  The information the system processes must constitute a strong basis of evidence. Vehicle data from the ANPR camera network is also used by TfL for scheme analysis and reporting, and to assist with their traffic management operations.

Facts & figures

With reductions calculated in CO2, PM2.5, NOx, NO2 and non-compliant vehicles it's clear to see the impact Siemens Mobility's Ultra Low Emission Zone has had on London's air pollution problem.











Source: Mayor of London 2019, Central London Ultra Low Emission Zone - Ten Month Report, Greater London Authority,

Ultra-Low Emission Zone Case Study - London, United Kingdom

Understand more about how Siemens Mobility is helping London to take a step towards a healthier, more sustainable future.

A breath of fresh air for today's cities

Low Emission Zone

Society's growing and justifiable concerns about noise and pollution from high-emission vehicles and traffic congestion need to be addressed as a matter of urgency. Low Emission Zone from Siemens is one of the key solutions.

How Low Emission Zone works in practice

  • Traffic managers and planners determine the zones where pollution management will be required and the class of vehicles they would like to exclude.
  • Working in consultation with you, Siemens Mobility installs Sicore ANPR cameras and air quality measuring equipment, using existing street infrastructure where possible.
  • The roadside equipment communicates directly with the Siemens cloud-based IT infrastructure, avoiding unnecessary cabling.
  • As part of the Low Emission Zone Service, Siemens Mobility offers predictive data for traffic and pollution, helping you as decision makers, implement the appropriate air quality strategy.
  • Siemens Low Emission Zone can be integrated to existing customer back-office billing solutions.
  • Siemens will be on hand to provide advice and subsequent system alterations to ensure that the solution continues to satisfy service requirements and effectively reduces pollution.  

Low Emission Zone - Reducing pollution where it matters

Low Emission Zone is a flexible, automatically enforced solution that uses best-in-class ANPR technology to search vehicle databases.  It monitors and controls the passing of highly polluting vehicles through designated geographic areas - a modular, innovative, highly secure and efficient solutions that is helping to address city air quality problems. 

Over a decade of air quality experience