Fine Dust Pollution (PM2.5–PM10) has become a major environmental challenge for many urban areas in Vietnam. While traditional street sweepers can remove coarse debris and visible dust, ultra-fine particulate matter continues to remain airborne, posing serious health risks to city residents.
To address this issue, next-generation street sweepers are now equipped with advanced fine-dust filtration systems, significantly reducing secondary dust emissions during operation. This approach is becoming a global standard, adopted by many “green cities” worldwide.
Two Major Limitations of Traditional Street Sweepers
1. Dust Re-emission:
High-speed side brushes combined with strong suction airflow often cause fine particles to be blown back into the environment.
2. Low Filtration Efficiency:
Conventional filters only capture particles larger than 10 micrometers, while PM2.5 — the most harmful to the respiratory and cardiovascular systems — easily passes through.
As a result, cleaning efficiency is often limited to 60–70%, and the surrounding air still contains large amounts of suspended dust.
Fine Dust Filtration Technology – The Core Advantage of Modern Sweepers
Leading global manufacturers are integrating three key filtration technologies to improve dust-handling performance:
1. HEPA H13/H14 Filters – Capturing 99.95% of PM2.5
HEPA H13/H14 filters use ultra-fine fiberglass fibers to trap:
Key benefits:
This is the European benchmark for premium urban sweeping equipment.
2. Cyclone Technology – Pre-Separating Dust Before HEPA
Cyclonic airflow generates a strong vortex that:
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Removes coarse dust and debris
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Reduces load on HEPA filters
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Extends filter lifespan by 3–5 times
When combined, Cyclone + HEPA increases filtration efficiency by up to 40% compared to traditional systems.
3. Wet Filtration (Mist/Fog System) – Preventing Secondary Dust Emission
Fine water mist or fogging systems help:
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Capture floating dust and bring it down to the ground
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Minimize secondary airborne dust
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Support brushes and suction nozzles for deeper cleaning
This technology is especially effective in:
Industrial zones, sunny urban roads, parking lots, and dusty asphalt surfaces.
Among the cleaning technologies available on the market today, Dulevo (Italy) stands out as one of the pioneers in developing the Mechanical Suction System – a sweeping mechanism that significantly reduces fine dust compared to conventional vacuum-based sweepers.
Dulevo’s Superior Operating Mechanism
Unlike traditional sweepers that rely almost entirely on high-velocity airflow, Dulevo combines two core principles to deliver exceptional dust-control performance:
1. Mechanical Sweeping
Two main brushes guide debris and dust directly toward the central sweeping path, minimizing the risk of particles being dispersed back into the air.
2. Low-Pressure Suction
A controlled, low-pressure airflow captures remaining dust without generating secondary dust re-emission, while also reducing fuel consumption.
3. Gore® Ultra-Fine Dust Filter – Global PM2.5 Standard
Dulevo integrates Gore® H13 filters with 99.7% efficiency for particles as small as 0.3 microns—a filtration technology typically found in heavy-duty industrial equipment and cleanrooms.
Thanks to this combination, Dulevo sweepers operate quietly, clean deeply, and release significantly less airborne dust—making them ideal for urban environments with stringent clean-air requirements.
Why Ultra-Fine Dust Filtration Is Becoming Essential in Vietnam
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Rapid urbanisation → Higher PM2.5 levels
Environmental reports consistently show annual PM2.5 concentrations exceeding WHO standards.
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Cities adopting Green City standards
Major urban areas such as Hanoi, Ho Chi Minh City and Da Nang are introducing requirements for low-emission, low-dust, fuel-efficient municipal sweepers.
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Lower street-maintenance costs
Less fine dust accumulation means fewer deep-cleaning cycles and reduced pavement wear.
Conclusion
Modern street sweepers are no longer designed simply to collect visible debris. Their most critical role today is to control ultra-fine particulate matter (PM2.5)—the pollutant most harmful to human health and urban air quality.
With advanced technologies such as HEPA filtration, Cyclone separation, wet dust suppression, and especially Dulevo’s Mechanical Suction System, next-generation sweepers enable cities to achieve:
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Deeper cleaning performance
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Minimal secondary dust emission
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Lower operating and maintenance costs
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Compliance with European environmental standards
This is the optimal pathway for improving urban hygiene and reducing air pollution across Vietnam’s major cities.