Saharan dust is lowering air quality across southern Portugal today
The DGS says airborne dust will affect mainland Portugal on 14 and 15 September, with Lisbon and the Tagus Valley, Alentejo and the Algarve most exposed.
Archived after its publication day. Search retains this original briefing for background and accountability.
Archived 12 September 2026People with asthma, other chronic respiratory conditions or cardiovascular illness—and families caring for children or older people—should reduce avoidable exposure while the episode lasts.
- The official warning covers 14 and 15 September 2026.
- The DGS expects the strongest impact across Lisbon and the Tagus Valley, Alentejo and the Algarve.
- PM10 particles can be especially difficult for children, older people and those with respiratory or cardiovascular conditions.
- Anyone whose symptoms worsen should contact SNS 24 on 808 24 24 24 or seek medical care; call 112 for an emergency.
What is happening
A mass of air carrying dust from North Africa is crossing mainland Portugal on Monday 14 and Tuesday 15 September. The national health authority expects poor air quality across the country, with the southern half—particularly Lisbon and the Tagus Valley, Alentejo and the Algarve—most affected.
The concern is the rise in naturally occurring inhalable particles known as PM10. A hazy sky or dusty car may be the most visible sign, but the practical issue is what people breathe while the particles remain suspended in the air.
Who should be most careful
The DGS singles out children, older people, anyone with chronic respiratory illness such as asthma, and people with cardiovascular conditions. Where practical, these groups should remain indoors with windows closed and avoid unnecessary time outside.
Everyone should limit prolonged exertion outdoors and avoid additional irritants such as tobacco smoke. People already receiving treatment for a chronic condition should continue it unless their clinician tells them otherwise.
How to make the decision today
Use the warning to change the timing or intensity of an activity, not to panic. A gentle necessary journey is different from a long run, outdoor work or strenuous sport. If plans are flexible, move demanding exercise indoors or wait until conditions improve.
Air quality can vary by place and hour. Check the current local reading before an outdoor activity, and pay attention to symptoms rather than relying only on how clear the sky looks. If breathing, chest or other symptoms worsen, use SNS 24 or medical care; call 112 for an emergency.
What you can do now.
- 01
Reduce prolonged outdoor exertion while the dust episode continues.
- 02
Keep vulnerable household members indoors with windows closed where practical.
- 03
Continue prescribed treatment and seek advice if symptoms worsen.
- 04
Check current local air-quality readings before resuming strenuous outdoor activity.
Have a place we should experience?
Invite the Hub for a hosted visit, propose a story, plan a clearly labelled campaign or apply for a business profile.