Clean air for cities worth living in

Contributing to healthcare

Air pollution - The invisible danger

91 percent of the world's population lives in places that exceed the air quality guidelines of the World Health Organisation (WHO). Around 4.2 million deaths per year worldwide are attributed to air pollution, according to the WHO. The most dangerous pollutants in urban air are particulate matter, ground-level ozone, nitrogen dioxide and sulphur dioxide.

The best way to achieve clean urban air is to avoid emissions from the outset. Unfortunately, this is not achievable in the short run because alternative solutions often have yet to be developed and because a complete ban on emissions e.g. from traffic would have negative impacts on the economy and society.

Given the massive negative consequences of air pollution, wait-and-see is not a good strategy.
Technical outdoor air cleaning offers a pragmatic solution and is available now.


City Air Cleaner

The City Air Cleaner filters up to 85 percent of harmful ambient pollutants such as fine dust particles and gaseous substances like nitrogen oxides, and ground-level ozone from the ambient air and creates a comfort breathing zone with better air quality

The casing design can be executed to match customer's needs:

  • neutral design corresponding to the installation site
  • corporate branding for company premises
  • luxury variant for exclusive working and living environments
City Air Cleaner S-60 Design Variant
City Air Cleaner S-60 Design Variant

Several City Air Cleaners work in combination to form a modular, scalable system for active management of urban air quality. Simulations of the real environment are used to determine an effective tailor-made air filter solution - for emission hotspots and constructionally and meteorologically caused accumulation points for pollutants.

The large infoscreens on the sides of the City Air Cleaners allow for local air quality infotainment as well as local traffic and event information or third-party advertising.

The City Air Cleaner is universally applicable. There are different models for tailor-made air cleaning solutions:

City Air Cleaner S60

Model S

The high-performance City Air Cleaner S-60 can filter up to 60,000 cubic meters of ambient air per hour, the equivalent volume of 1.800 standard containers. It was developped for outdoor application and can be used also indoors.

  • Customised filter system for optimal cleaning performance
  • Large airflow volume with powerful air intake and smooth air outlet
  • 24/7 availability with demand-driven control
  • Integrated LED screen for infotainment or local advertisement

Model M

The compact City Air Cleaner M-20 is suitable for outdoor and indoor applications. It cleans up to 20,000 cubic metres of ambient air per hour.

  • Customised filter system for local mixture of pollution
  • High cleaning volumes with limited setup space
  • 24/7 availability with demand-driven operation
  • Integrated LED screen for infotainment or local advertisement 


Test Model S-40

The Test Model S-40 is regularly used for practical tests under real conditions. These are accompanied by measurements of the local pollutant load and cleaning performance and serve as a basis for the subsequent simulation of the optimum cleaning solution.

  • Fully functional prototype for testing purposes
  • Air cleaning capacity up to 40,000 cubic metres per hour
  • Easy transportation and setup thanks to integrated running gear
  • Autonomous battery operation


Urban pollution hotspots

For effective absorption of pollutants on a busy road, City Air Cleaners are ideally placed on both sides of the road

There are three different areas of application in which City Air Cleaners can make an active contribution to air quality management:

  • Zones with particularly high pollutant emissions
    Primary air pollutants such as car exhaust gases and fine dust caused by tyre or brake wear can be directly attributed to the polluters. Avoiding them is the best solution. If this is not possible, it is best to remove them directly at the point of emission. By directly extracting and filtering out the primary pollutants from the ambient air, the formation of secondary air pollutants is also prevented.

  • Zones with accumulation of high concentrations of pollutants
    In complex reactions in the atmosphere, additional gaseous pollutants and suspended matter are formed from primary emissions. The accumulation and distribution of these pollutants depends directly on weather conditions. Elevated levels of particulate matter are a problem, especially in winter when weather conditions are poorly exchanged. Unfavourable structural constellations can also contribute to this phenomenon.

  • Zones with increased air quality requirements
    Children and elderly persons, as well as people with respiratory diseases such as asthma, are particularly vulnerable in large cities due to poor air quality. Creating comfort breathing zones with better air quality in heavily polluted places where these groups of people regularly spend long periods of time, such as schoolyards, playgrounds, seniors residents, or public transport stations, is a good investment in health and well-being.

Working principle

Active contribution to air quality levels

The City Air Cleaner achieves the best air quality management effect directly at the point of emission. On a busy road, the device can extract the fine dusts and nitrogen oxides emitted by the vehicles directly at the source and filter them out of the air stream. This prevents the harmful pollutants from spreading into the environment.

The cleaned air is slowed down and released on the other side of the City Air Cleaner. The constant flow of freshly cleaned air improves the ambient air on the pavement by displacing the existing polluted air immediately behind the city air cleaner. At the same time it dilutes the prevailing pollutant concentration in the ambient air on the outlet side.

Intake behaviour using a smog machine


Reduce elevated pollutant concentrations

City Air Cleaners help to reduce elevated pollutant concentrations locally in the short term and reduce further spread. At the same time, they ensure that filtered air is supplied to endangered immission locations.

  • Available technology
    to immediately and actively reduce the pollution of the population in places with particularly poor air quality
  • Active contribution to meeting statutory air quality standards
    in zones with excessive air pollution in relation to the prescribed values
  • reduction of local pollutant concentrations
    by direct extraction of the pollutants at source
  • Reduced generation of secondary air pollutants
    through the direct extraction of primary pollutants
  • Measurable improvement in air quality
    in the vicinity of the city air cleaners by effective filtering of pollutants from the ambient air sucked in
  • Reduction of pollution in the air we breathe
    in the sphere of action of city air purifiers by active dilution of the ambient air


Innovative solution with proven technology

The City Air Cleaner represents an innovative solution for the effective technical cleaning of air volumes contaminated with pollutants for defined zones in urban environments. When designing the filter technology and air duct, we rely on best-in-class technology from internationally renowned filter and ventilation manufacturers.

Pollutant filter

The heart of the City Air Cleaner are the synchronously operating multi-stage filter units. We use certified quality filters with maximum performance, taking into account cost-efficient operation and total life cycle costs.

  • Customised selection of filter media according to the type and concentration of the pollutants
  • Selection and arrangement of the filter stages in combination with the fans for optimum filter performance and efficiency

Coarse filter

The wear-free stainless steel mesh of the pre-filters prevents sand, dust, flying plant parts and small particles and water from entering the main dirt filter media system.

  • Increased service life of the main filters
  • Durable
  • Easy to clean
  • Protection against vandalism

High air absorption capacity and even distribution of cleaned air

The primary control variable for the overall cleaning performance is the airflow volume. The City Air Cleaners clean only as much air as required, by means of a demand-driven system control. The fans are designed for continuous operation 24/7. For this reason, special attention is paid to energy efficient operation.

On the air outlet side, in addition to the housing fins, air-guiding elements ensure an even diffusion of the cleaned air flow.

Sensors for monitoring pollutant concentrations 

Pollutant sensors (e.g. particulate matter PM10, PM2.5 or nitrogen dioxide) can be integrated to monitor the air quality at the air inlet and air outlet side. This allows the air filter system to be controlled according to requirements in a demand-driven operation mode.

System control and monitoring

The City Air Cleaners are operated automatically and offer remote control and monitoring. In order to keep energy consumption as low as possible, predefined cleaning intervalls based and integrated sensors ensure demand-driven operation.

The data of a City Air Cleaner system is automatically transmitted to the Purevento Service Cloud around the clock, all year round. There they are stored, processed and visualised centrally.



City Air Cleaner S60


A proven 85 % reduction of toxic substances in the air absorbed – both nitrogen-oxides and particulate matter



Multi-stage filter system for flexible adaptation of filter media to specific local contamination scenarios



Flexible and easy to erect without foundation and ready for operation at short notice



Demand-driven control of the system with monitoring of the operating performance for preventive maintenance



Demand-driven operation taking into account local noise pollution


A proven 85 % reduction of toxic substance in the air absorbed – both nitrogen-oxide and particulate matter

City Air Cleaner S60


Multi-stage filter system for flexible adaptation of filter media to specific local air pollution scenarios


Ideal ratio of cleaning performance to power consumption, operating and maintenance costs


Flexible and easy to set up without foundation and
ready for use at short notice


Demand-driven system control and monitoring of the operating performance for preventive maintenance

Low noise

Demand-driven operation
taking into account
local noise pollution


Success Stories

Purevento wins first European tender for urban air purifiers

Kiel is a Northern German state capital and an important intermodal transport and tourism hub in northern Europe for cruise ships, ro-ro ships and passenger ferries from Germany to Scandinavia and the Baltic Sea, alongside the world's busiest artificial waterway, the Kiel Canal.

Kiel is also one of the cities in Germany that has so far failed to comply with the required pollutant limits at all local hotspots. At the beginning of 2019, Purevento successfully tested its prototype of the City Air Cleaner under the supervision of the Schleswig-Holstein State Environment Agency and the city authorities at the city ring road Theodor-Heuss-Ring. The city of Kiel will be installing six Purevento urban air purifiers for at least three years from October 2020. Thus, Kiel wants to comply with the required limit value for nitrogen dioxide of 40 micrograms per cubic metre on this main traffic axis without having to impose driving bans on private diesel cars Euro 1 – 5.

Aufstellung der Luftreinigungsanlage am Theodor-Heuss-Ring (Bild: LH Kiel)

Installation of 6 City Air Cleaners on Theodor-Heuss-Ring, Kiel (Picture: LH Kiel)

With its tailor-made solution and a convincing overall concept, Purevento was able to successfully prevail in the Europe-wide competition. Proof of effectiveness for the air filter system at the site was provided by a scientific analysis. For more information, please contact us.

Customised solution

We offer modular, scalable air purification solutions for actively improving air quality in places with particularly high concentrations of pollutants in the air at main traffic axes and junctions or for use in areas with special air quality requirements.

For each location, we create a demand-oriented air purification concept using chemical reaction models and dynamic airflow analyses of the local conditions, which also include wind and weather data.

We are happy to advise you: 

Phone: +49 (0) 4154 99 303 16


Frequently Asked Questions

How does the city air cleaner work?

The basic principle is quite simple: the ambient air is actively sucked in, fine dust and gaseous pollutants such as nitrogen oxides are retained in a multi-stage filter process. The cleaned air is released into the environment. The key characteristic of the purevento city air cleaner is the unique accumulation of several attractive features: good cleaning performance, low energy consumption, uncomplicated handling and cost-effectiveness are in balance - thanks to the ideal combination of proven technologies and patent-pending innovations.

Where does a city air cleaner make sense?

In short: Wherever the air is polluted with excessive concentrations of pollutants, worldwide. This can be on busy roads and squares, in regions with smog pollution, on construction sites and other places where a lot of dust is generated. The city air purifier can help companies, retailers and organizations, property developers, hotels and restaurants with outdoor areas, airports and supermarket car parks, wherever the air pollution is too high.

Are connections and other preparations necessary?

Dimensions, weight and mode of operation are optimized for easy relocation and handling - no foundation required. Model E of the urban air purifier is fully self-sufficient and does not require any connections, Model S is supplied with additional energy by an external power supply. In any case, the city air purifier is ready for operation within a short time.

What noise is to be expected?

The city air purifier is low-noise, even in full operating mode it is no louder than the background noise of a busy café. As a rule, traffic noise will predominate anyway, because the city air purifier only becomes active when the pollution in the ambient air requires it - as in rush hour, for example.

How strong are the air flows at the urban air cleaner?

The suction airflow is about as powerful as that of a larger vacuum cleaner, strong enough for effective efficiency, but moderate enough not to restrict road traffic or pedestrians. The purified air is distributed and slowed down before it gently flows out at the top of the city air purifier.

Where can I experience a city air cleaner in operation?

Come and visit us in Trittau in the south of Schleswig-Holstein and experience the city air purifier in action. We would be pleased to inform you about the current status of further installations. You can simply contact us by mail.

What does a city air cleaner cost?

During the development of the device, economic efficiency in relation to performance was the top priority. Depending on the model, configuration, extras and last but not least the desired quantity, we can make you an attractive, individual offer. Our sales team is looking forward to making you a proposal:

What does the brand name "Purevento" mean?

Our brand name "Purevento" is composed of the terms "Pure" for "pure" and "vento" for "wind". This combination of words illustrates the air-purifying effect of a fresh breeze that helps reduce the concentration of air pollutants - just like Purevento's urban air cleaner.

Should air pollution better be avoided instead of cleaning air afterwards?

Of course, this must be the primary objective of all efforts to achieve clean air. However, this is a long way off: as long as cars are powered by combustion engines, the air is polluted with solid and gaseous pollutants. Even purely electric road traffic would still produce fine dust due to tyre and brake abrasion. Therefore, an interim solution for better air quality makes sense in many places. The urban air purifier sees itself as a bridging technology that provides relief until the causes of air pollution have been eliminated in the long term.

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