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Negative ions near breaking waves are often promoted as a health boost. A practical, evidence-aware guide for Northern Beaches and North Shore locals who love the coast.

Lucky to live near the surf

Few cities have beaches as close as Sydney's. If you live on the Northern Beaches or the North Shore, you have probably heard someone say that sea air is good for you because of negative ions. It is a popular idea, so here is a plain guide to what is fact, what is myth and what is simply unknown.

Fact: moving water creates negative ions

Negative ions are particles in the air carrying a negative electric charge. They form when water collides and breaks apart, so surf, waterfalls and fast-flowing rivers are thought to be rich sources. Fresh air in natural areas also contains them.

Fact: cities tend to have fewer

Air pollution, traffic and indoor spaces are reported to lower negative ion levels considerably compared with the coast.

Unproven: big health claims

You will often read that negative ions improve mood and appetite, stop headaches, calm allergies or reduce airborne viruses. Studies so far have given mixed results and these claims have not been established. Research is ongoing, so it is best not to rely on ions for any health purpose.

Myth-busting the gadgets

USB ionisers

These plug into a laptop and are sold to office workers. Reliable evidence for any wellbeing benefit is lacking.

Ionic light bulbs

Sold for homes, offices, garages and workshops, they are said to give off negative ions when switched on. Again, the evidence is limited.

Some ionising air appliances also produce ozone, which can irritate the lungs, so check product details before buying.

Practical ways to enjoy the coast

• Plan a regular beach walk, early morning or late afternoon, to avoid the strongest sun.
• Wear sunscreen, a hat and sunglasses.
• Leave the city behind now and then to decompress somewhere with fresh air and water.
• On busy days, open windows, enjoy a shower or keep a small fountain at home for the sound of moving water.

The takeaway

Whatever the science on ions eventually shows, a walk by the waves is free, enjoyable and a chance to move and breathe deeply. For allergies, headaches or other health concerns, see your GP rather than relying on the beach or a gadget.