Floods and indoor air: what happens afterwards and how to protect yourself

When the water recedes, the problem stays in the air

In recent years Italy too has experienced major floods, from Emilia-Romagna to Tuscany and the Marche. When the water recedes, attention rightly goes to the visible damage: furniture, floors, systems. But there is a less obvious aspect that lasts much longer: the quality of the air inside the home.

Waterlogged walls, floors and furniture become the ideal environment for mold and bacteria, drying mud releases fine dust, and floodwater brings odors and chemicals with it. As we will see, the greatest risk is not in the first few days but in the weeks of drying, cleaning and renovation.

What remains in the air after a flood

Why mold persists for weeks: what studies show

The floods most studied from the point of view of indoor air quality are in the United States, and the results are very clear.

The message is simple: the air most loaded with contaminants is not outdoors, but inside homes that have not yet been dried and remediated, and the most delicate period is precisely the work phase.

The highest-risk phases

• Removing wet materials: plasterboard, insulation, carpet, mattresses and chipboard furniture release spores and dust when they are dismantled and taken away.
• Cleaning mud and sediment: sweeping or scraping dried mud disperses fine dust and bacteria.
• Drying: dehumidifiers and fans are essential, but they move the air and can recirculate spores already present.
• Renovation: demolition, plaster removal and sanding produce large amounts of dust, often while people are already living in the home.

What to do, in order of priority

1. Dry out as soon as possible: open up, ventilate, use dehumidifiers. The longer materials stay wet, the more time mold has to grow.
2. Remove what cannot be saved: soaked porous materials (plasterboard, insulation, carpet, mattresses) usually need to be discarded, not just cleaned.
3. Ventilate throughout the work, weather permitting.
4. Protect yourself: during removal and cleaning wear FFP2 masks, gloves and goggles, and keep children, the elderly and people with respiratory problems away from the rooms being worked on.
5. Do not close up and heat rooms that are still damp without air exchange: heat and humidity together accelerate mold growth.
6. For extensive damage, call in professionals for remediation and restoration.

Where an air purifier helps

During drying, cleaning and renovation, and in the following weeks, a purifier running continuously in the rooms you live in reduces the particles and odors in the air:

• the medical-grade HEPA filter captures mold spores, bacteria and fine dust: according to official Austin Air data, 99.97% of particles at 0.3 µm and 99% at 0.1 µm;
• the activated carbon and zeolite, up to 6.8 kg in standard models, adsorb damp and musty odors, gases and VOCs, including those from cleaning and disinfection products;
• the pre-filter stops larger particles and protects the inner stages: in these situations it is worth vacuuming it more often.

Which Austin Air model to choose

• HealthMate®: the choice for general home use. According to Austin Air, the carbon in the base models also treats mold-related mycotoxins.
• Bedroom Machine®: for the bedroom, where you spend many hours even during the work, with the additional HEGA carbon cloth stage.
• Immunity Machine®: for the most demanding situations, or when there are people with heightened immune vulnerability in the home.
• HealthMate Junior: for rooms up to 40 m².

To learn more about types of mold, risks and prevention, also read our article on mold in your home.

In summary

After a flood, the air at home remains loaded with mold, bacteria, dust and odors for weeks, especially during the work. The priority is to dry out, remove unsalvageable materials and remediate, protecting yourself during these operations. An air purifier with a medical-grade HEPA filter and a large amount of activated carbon helps reduce what is released into the air in this phase, and makes the rooms you keep living in more breathable.

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