How long does covid virus stay in the air?

Breathing, talking, singing, coughing and exercising release respiratory particles. Smaller particles can travel beyond arm's reach and build up in a poorly ventilated room, while outdoor air disperses them more readily. Risk is shaped by shared time, distance, airflow and whether a person is infectious; it cannot be judged from a single fixed time.

An open window, mechanical ventilation or a suitable air cleaner can lower the amount of contaminated air. Surface hygiene still helps, but it does not replace improving shared air.

Open windows or doors where safe, use ventilation systems correctly, and avoid crowded enclosed spaces when respiratory illness is circulating. Spend time outdoors when practical. A well-fitting mask can add protection in busy indoor settings or around someone who is unwell. If you have symptoms, limit close indoor contact and improve airflow around others.

Arrange medical advice if you develop persistent fever, worsening cough, unusual tiredness or changes in smell or taste after a possible exposure. Seek urgent help for difficulty breathing, chest pain, new confusion, fainting, blue or grey lips, or inability to stay awake. People with higher medical risk should ask promptly about testing and treatment options.

How can I improve ventilation in my home or workplace? Should I use a mask around household members? Which symptoms or health conditions mean I should seek assessment sooner?