Heating Season Is Coming: PM2.5 in Northern Italy and How to Reduce Exposure

As the heating season approaches, the air we breathe deserves attention too. In Northern Italy’s Po Valley, geography and weather can allow fine-particle pollution to build up. Here is what PM2.5 means for health—and what you can do, with or without a ventilation system.

Why Northern Italy’s air needs attention

The Po Valley is surrounded by the Alps and Apennines. During periods of light winds and temperature inversions, pollution from heating, traffic and other activities can remain close to the ground. Source: ESA

Invisible particles. Real health effects.

PM2.5 means airborne particles no larger than 2.5 micrometres. They can penetrate deep into the lungs. Exposure is associated with respiratory and cardiovascular disease; repeated exposure matters beyond the obvious smog days. Source: WHO

Children, older adults and people with heart or respiratory conditions deserve particular attention during pollution episodes. WHO health guidance

Which cities have high PM2.5 levels?

Among the provincial capitals monitored in Legambiente’s Mal’Aria 2026 report, the highest 2025 annual averages included:

Milan, Pavia, Vicenza, Turin and Padua were reported at approximately 20 µg/m³. These are annual averages, not today’s readings or a ranking of every town. Source: Legambiente, 2025 ARPA data, Table 4

For comparison, the WHO annual guideline is 5 µg/m³—a health recommendation, separate from legal limits. WHO air quality guidelines

Three practical steps before the heating season

1. Check the air near you

Use your regional ARPA reports or the European Air Quality Index. Local conditions matter, including near busy roads and homes using solid fuels.

2. Adjust your daily routine

Choose less polluted routes and times for outdoor activity. At home, reduce particle sources such as smoking and unnecessary burning. Check local advice during pollution episodes. WHO practical advice

3. Give indoor air some attention

Maintain the ventilation your home needs. If you have an MVHR system (mechanical ventilation with heat recovery)—check its filters. Without an MVHR system, a suitably sized portable particle air cleaner can help reduce indoor particles, alongside controlling indoor sources. WHO: indoor air and filtration

Have an MVHR system? Check its incoming-air filter

Where your unit supports it, a compatible F7 / ePM1 60% supply-air filter is an option for fine-particle filtration. F7 is the familiar older classification; ePM1 60% is the declared PM1 efficiency class. The two labels are not automatically equivalent. Eurovent filter selection guidance

The synthetic nanofibre material used in our F7 filters offers up to 80% PM2.5 filtration efficiency, according to supplier technical data. This is material performance, not a promise of 80% cleaner air throughout the home.

ZenAero’s selected filters are made in the EU. The supplier describes the F7 Nano material as fully synthetic and mechanically filtering, without an artificial electrostatic charge. Correct fit helps limit air bypass, while airflow resistance also matters for fan energy use. Eurovent: airflow resistance and energy

“I live in an area where solid fuels are used for heating and experience poor air quality firsthand. That is why I use an F7 / ePM1 60% filter in my own compatible MVHR during autumn and winter.” — A personal note from ZenAero

Selected F7 filters for compatible MVHR models

Already have one of these units? Check its exact version and filter dimensions before choosing.

Other model? Browse ventilation filters or send us your MVHR model for help choosing.

Frequently asked questions