Lessons From Florence Nightingale: Fresh Air, Sunlight and Community
By Carl
Updated November 4, 2026 · 6 min read
In this guide
When you or someone in your home has a cold, the flu, Covid, RSV or another respiratory illness, you can end up spending days indoors. The same happens during a long winter or a stretch of smoky or stormy weather. The basic conditions that support health and recovery in those stretches are not new. Florence Nightingale identified them more than 100 years ago, after her experience as a nurse during the Crimean War (1853-1856):
- “Of all the remedies I have used or seen in use, I can find but one thing that I can call remedial for the whole disease… and that is a profuse supply of fresh air.”
- “Second only to fresh air, however, I should be inclined to rank light in importance for the sick. Direct sunlight, not only daylight, is necessary for a speedy recovery.”
- “The health of the home/community are critical components in an individual’s health.”
The advice is still startlingly simple: open your windows for fresh air, go outside when able for direct sunlight, and stay connected with the people around you.
Why this is harder today
Nightingale’s principles worked easily in a war-time hospital, where air moved freely and patients were cared for together. Today most of us live in tightly built homes and apartments that are deliberately designed to keep the outdoors out. Our protective structures do not always allow fresh air and sunlight, the foundational natural elements of health and healing. Families also rarely live close together, so a person who is sick can end up confined and isolated. The principles still work, but they need modern methods.
Fresh air
Ventilation brings in outdoor air that dilutes the particles and pollutants built up indoors, including the germs a sick person breathes out. There are two simple ways to increase fresh air using just your windows:
- Continuous Ventilation (ideal): In acceptable weather, keep at least 2 windows open 1/2”, or just enough to feel air (but not a draft) on the back of your hand when your hand is close to the window. To maximize air circulation, open windows on opposite sides of the house on each floor, or one on the top floor and one on the lowest floor. Keeping windows slightly “cracked” like this should not significantly impact your utility bill or your comfort.
- Periodic Ventilation (good): During inclement weather or if keeping your windows open all the time isn’t possible, open windows or doors wide for 5 to 15 minutes, a few times a day. The most effective times are in the morning when everyone wakes up, while cooking, and just before bedtime. If you find that the air is stuffy or uncomfortable at other times, ventilate more often. To maximize air circulation, open windows on opposite sides of the house and on each floor.
If outdoor pollution from pollen (opens in a new tab), industrial sources, and/or nearby traffic makes natural ventilation difficult or undesirable, other methods are available. The simplest is to attach appropriate filters onto an ordinary box fan in a window to pull in filtered outside air. A MERV 13 or equivalent furnace filter is effective at reducing particles from the air. Carbon filters can also be used to reduce odors, car exhaust, and chemical pollutants. The filters are simply taped to the box fan per the following instructions.
Sunlight
Direct sunlight can be as important as fresh air. The simplest way is by going outside when and where the sun is shining. If you take a walk in the sunshine you get the double benefit of sunlight and fresh air. Sitting on a small patio or deck for even a few minutes a day is beneficial. If the weather doesn’t allow or if you are physically unable to move, open a window and sit in direct sunlight. Light through the window glass is not the same. Open the window.
Another possibility is a light therapy lamp. Most look like an ordinary table lamp with bulbs that create light similar to midday sunlight. While not as effective as direct sunlight they can help, especially in the dark months. Prices range from about $30 for a small lamp to several hundred dollars for a larger one. There are details from the Mayo Clinic (opens in a new tab) here.
Community
Personal interactions with those you love and trust are just as important as the physical exposures from air and sun. Isolation, especially for singles and the elderly, can lead to depression and a lack of sufficient self-care. When you or someone you care about has a contagious illness, keeping some physical distance is sensible, which makes it more important to find other ways to stay in touch. Phone calls and video calls let you see the person, where they are and what they are doing, and many families stay close this way across towns and even countries. Food, medicine and other basic supplies can often be delivered by grocery stores and pharmacies, so a neighbor or relative can help without coming inside.
The air indoors when you are home all day
Spending all day and night at home increases the accumulation of carbon dioxide, cooking odors (opens in a new tab), body odors, and moisture, because most houses are designed for intermittent occupancy rather than constant use. The indoor environment (opens in a new tab) can become overwhelmed. A few habits help:
- Run exhaust fans when showering and cooking to manage moisture.
- Vacuum carpet more often with a HEPA filtered vacuum cleaner to reduce the dust that builds up and gets stirred up, and wipe down surfaces.
- Install a MERV 13 or equivalent filter in a forced air system.
- Ventilate, as described above. It is the primary way to manage all of these factors.
Ventilation has limits at the weather extremes. Outside air that is hot and humid can make the house uncomfortable and raise the indoor Relative Humidity (RH) to levels that support mold growth (opens in a new tab). Outside air that is very cold can have the opposite effect and leave the air too dry. Condensation is a further concern when a surface is chilled by outside air or when the RH rises. For more on managing moisture and ventilation, see the Hayward Score Resources page.
What we can learn from Florence Nightingale is what to do: fresh air, sunlight and community. Our challenge is how to do it in modern homes, and a few open windows, some time in the sun and a phone call are a good place to start.
Reference:
All quotations taken from publicly available PDFs of Florence Nightingale to Her Nurses (MacMillan and Co, London 1914) and Notes on Hospitals ( 3rd Edition, Longman, Green, Longman, Roberts, and Green, 1863).
Sources
- National Allergy Forecast & Info About Allergies (pollen.com)
- Light therapy (Mayo Clinic) (mayoclinic.org)
- Addressing Kitchen Contaminants for Healthy, Low-Energy Homes (indoor.lbl.gov)
- Indoor Air Quality (IAQ) (US EPA) (epa.gov)
- Mold (US EPA) (epa.gov)
