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St Paul's Bay

San Pawl il-Baħar · Malta · Traffic · Urban

What's affecting the air?(4)

Conditions across the Maltese Islands that may be influencing air quality. Context explains a reading; it never adjusts one, and it does not establish the cause of any individual measurement.

  • Saharan dust forecast

    The CAMS model forecasts mineral dust concentrations peaking near 40 µg/m³ over the Maltese Islands, with an aerosol optical depth of about 0.37. Dust transported from North Africa may contribute to elevated PM10 and, to a lesser extent, PM2.5. Dust is a natural source, but the particles it adds affect health in much the same way as other coarse particulate matter.

    May worsen air quality

    ForecastModerate confidenceMaltese Islands

    Most relevant to: PM10, PM2.5

    –

    Source:Copernicus Atmosphere Monitoring Service (CAMS), via Open-Meteo (Opens in a new window)

    Retrieved at

  • Light winds and limited dispersion

    Wind speeds are forecast to fall to about 3.3 km/h for around 11 hours. Light winds may allow locally emitted pollutants — traffic nitrogen dioxide and fine particles in particular — to accumulate near the ground instead of dispersing.

    May worsen air quality

    ForecastModerate confidenceMaltese Islands

    Most relevant to: NO₂, PM2.5, PM10

    –

    Source:Open-Meteo weather forecast (ECMWF and DWD models) (Opens in a new window)

    Retrieved at

  • Conditions that may favour ozone formation

    Warm, sunny and lightly ventilated conditions are forecast around the middle of the day, with temperatures near 33.9 °C. Ozone is formed in sunlight from other pollutants rather than emitted directly, so this combination is likely to raise afternoon ozone levels.

    May worsen air quality

    ForecastModerate confidenceMaltese Islands

    Most relevant to: O₃

    –

    Source:Open-Meteo weather forecast (ECMWF and DWD models) (Opens in a new window)

    Retrieved at

View all(1)

  • Shallow mixing layer — possible temperature inversion

    The forecast mixing layer drops to about 35 m with warmer air above it. That pattern is the signature of a temperature inversion, which may trap pollutants close to the ground overnight and into the early morning. This is a model-based indication rather than a measured inversion.

    May worsen air quality

    ForecastLower confidenceMaltese Islands

    Most relevant to: NO₂, PM2.5, PM10

    –

    Source:Open-Meteo weather forecast (ECMWF and DWD models) (Opens in a new window)

    Retrieved at

Source:Open-Meteo weather forecast (ECMWF and DWD models) (Opens in a new window)Source:Copernicus Atmosphere Monitoring Service (CAMS), via Open-Meteo (Opens in a new window)

Retrieved at

Air quality now

St Paul's Bay: Fair2.2Provisional

Air quality is fair. Outdoor activities are fine for most people.

Concentrations are a little above the lowest band but remain well within everyday levels.

Leading pollutant: PM10The pollutant with the highest sub-index at this hour. The overall band is the worst sub-index across the pollutants this station reported.

Live1 hour oldMeasured at Retrieved at

Next reading expected around Wed 29 Jul, 19:58

Near-real-time readings are provisional. ERA validates data after publication, and figures may be revised.

Pollutants measured

Measured at Wed 29 Jul, 18:00

  • PM2.5, fine particulate matter

    8.3 µg/m³

    PM2.5, fine particulate matter: Fair2.2

    Averaging period: Hourly

  • PM10, coarse particulate matter

    Leading pollutant

    23 µg/m³

    PM10, coarse particulate matter: Fair2.2

    Averaging period: Hourly

  • Nitrogen dioxide

    12 µg/m³

    Nitrogen dioxide: Fair2.1

    Averaging period: Hourly

  • Ozone

    64 µg/m³

    Ozone: Fair2.1

    Averaging period: Hourly

  • Sulphur dioxide

    0.8 µg/m³

    Sulphur dioxide: Good1.0

    Averaging period: Hourly

Trends and recent history

Hourly values as published, including hours the feed filled in by modelling.

The published feed carries roughly ten days of hourly history and about two days of forecast, so no longer window is offered. Hours the instrument did not report are shown as gaps. This view covers 65 hours from Tue 28 Jul, 20:00 to Fri 31 Jul, 12:00.

Concentration (µg/m³)

Time (Malta)

  • Measured
  • Estimated
  • Forecast
  • Everything to the right of this line is forecast.
  • Good 0–10 µg/m³
  • Fair 10–25 µg/m³
  • Moderate 25–60 µg/m³

Nitrogen dioxide at St Paul's Bay, hourly, in µg/m³, covering the last 24 hours. The published points run from Tue 28 Jul, 20:00 to Fri 31 Jul, 12:00. 65 hours are shown: 21 measured, 2 filled in by modelling, 42 forecast, and 0 with no value at all. Measured values ran from 2.4 µg/m³ at Wed 29 Jul, 05:00 to 40 µg/m³ at Tue 28 Jul, 20:00, averaging 17 µg/m³ across the 21 measured hours.

Show the values as a table
Values shown in the chart above — Nitrogen dioxide, µg/m³.
Time (Malta)ValueBandHow the value was obtained
40 µg/m³ModerateMeasured
32 µg/m³ModerateMeasured
34 µg/m³ModerateMeasured
18 µg/m³FairMeasured
9.1 µg/m³GoodMeasured
7.6 µg/m³GoodMeasured
6.9 µg/m³GoodMeasured
12 µg/m³FairEstimated
13 µg/m³FairEstimated
2.4 µg/m³GoodMeasured
11 µg/m³FairMeasured
15 µg/m³FairMeasured
19 µg/m³FairMeasured
23 µg/m³FairMeasured
20 µg/m³FairMeasured
19 µg/m³FairMeasured
23 µg/m³FairMeasured
19 µg/m³FairMeasured
12 µg/m³FairMeasured
16 µg/m³FairMeasured
8.9 µg/m³GoodMeasured
12 µg/m³FairMeasured
12 µg/m³FairMeasured
15 µg/m³FairForecast
14 µg/m³FairForecast
15 µg/m³FairForecast
13 µg/m³FairForecast
12 µg/m³FairForecast
12 µg/m³FairForecast
10 µg/m³GoodForecast
10 µg/m³GoodForecast
9.0 µg/m³GoodForecast
10 µg/m³GoodForecast
11 µg/m³FairForecast
15 µg/m³FairForecast
20 µg/m³FairForecast
18 µg/m³FairForecast
15 µg/m³FairForecast
13 µg/m³FairForecast
11 µg/m³FairForecast
9.0 µg/m³GoodForecast
9.0 µg/m³GoodForecast
9.0 µg/m³GoodForecast
9.0 µg/m³GoodForecast
10 µg/m³GoodForecast
10 µg/m³GoodForecast
12 µg/m³FairForecast
15 µg/m³FairForecast
17 µg/m³FairForecast
23 µg/m³FairForecast
24 µg/m³FairForecast
21 µg/m³FairForecast
20 µg/m³FairForecast
12 µg/m³FairForecast
12 µg/m³FairForecast
12 µg/m³FairForecast
12 µg/m³FairForecast
15 µg/m³FairForecast
18 µg/m³FairForecast
22 µg/m³FairForecast
23 µg/m³FairForecast
21 µg/m³FairForecast
20 µg/m³FairForecast
15 µg/m³FairForecast
13 µg/m³FairForecast
Lowest measured
2.4 µg/m³
Average of measured hours
17 µg/m³
Highest measured
40 µg/m³
Hours with a measured value
21 of 65

Figures cover directly measured hours only. Modelled and forecast hours are excluded from the minimum, maximum and average. Near-real-time data is published before validation and may be revised or withdrawn by ERA.

Some past hours are modelled too: the feed fills gaps when an instrument does not report. Those points are marked as estimated. All times are shown in Malta time.

How this compares

NO₂ — 12 µg/m³

  • Below the EU limit value of 200 µg/m³

    200 µg/m³ over 1 hour · Reference: Directive 2008/50/EC Annex XI

  • Below the EU limit value of 40 µg/m³

    40 µg/m³ over Calendar year · Reference: Directive 2008/50/EC Annex XI

  • Below the WHO guideline of 25 µg/m³

    25 µg/m³ over 24 hours · Reference: WHO 2021

  • Above the WHO guideline of 10 µg/m³

    10 µg/m³ over Annual · Reference: WHO 2021

    This limit applies to an average over a calendar year, so a single hourly reading cannot show whether it has been breached.

EU limit values describe legal compliance over long averaging periods. The index bands above are for communication and are a different thing entirely. WHO guidelines are health-based guidance, not law.

What this means for you

Advice for the current band: Fair

For most people

Outdoor activity remains fine for the general population.

If you are more sensitive

A small number of unusually sensitive people may notice mild symptoms during long outdoor exertion.

Who is more affected, and why
Children
Children breathe more air for their size and spend more time active outdoors, so they take in relatively more of whatever is in the air.
Older adults
Existing heart or lung conditions become more common with age, and these are what air pollution tends to aggravate.
People who are pregnant
Reducing avoidable exposure during raised episodes is a reasonable precaution.
People with asthma
Raised particles, nitrogen dioxide and ozone can all trigger symptoms. Keep reliever medication to hand on poor-air days.
People with lung conditions
COPD, bronchitis and similar conditions can flare when levels rise. Plan outdoor activity for cleaner hours where possible.
People with heart conditions
Fine particles are the pollutant most closely linked with cardiovascular effects during raised episodes.
People who work outdoors
Long shifts outdoors mean higher cumulative exposure than a short trip. Take breaks indoors when levels are raised.
People exercising hard outdoors
Hard exercise draws more air deeper into the lungs and often through the mouth, bypassing the nose. Consider rescheduling intense sessions when levels are raised.

Advice here is general and precautionary. Air quality is one factor among many, and staying active remains beneficial. If you have severe or sudden symptoms, seek medical help rather than relying on this page.

maqua.app provides general environmental information and does not replace medical advice or official emergency guidance.

Estimated air-quality outlook

Estimated

Forecast values are model output, not measurements. Modelled estimates from the Copernicus atmosphere service, carried in the same feed.

Prepared at
Based on measurements up to
Published outlook
Wed 29 Jul, 18:00 to Fri 31 Jul, 12:00 (43 hours)

Moderate confidence

  • Looks 20 hours ahead, where the official model becomes less certain.

Highest band expected Fri 31 Jul, 12:00 Highest expected band: Moderate3.6

  • Highest band estimated for this day: Fair

    Estimated · Higher confidence · 6 forecast hours

    Driven by O₃

  • Highest band estimated for this day: Moderate

    Estimated · Moderate confidence · 24 forecast hours

    Driven by O₃

  • Highest band estimated for this day: Moderate

    Estimated · Lower confidence · 13 forecast hours

    Driven by O₃

Why the outlook looks like this

  • Saharan dust alongside a rising particulate forecast

    Mineral dust is forecast over the Maltese Islands, peaking near 40 µg/m³, at the same time as the official forecast shows coarse particulate levels rising. Dust transported from North Africa may contribute to the increase.

    May push levels upModerate confidence –

    Source:Copernicus Atmosphere Monitoring Service (CAMS), via Open-Meteo (Opens in a new window)

What this outlook cannot tell you

  • These are modelled values for St Paul's Bay, not measurements, and may differ from what is later recorded there.
  • The model describes regional conditions. It cannot anticipate a local event such as roadworks, a fire or a fireworks display.
  • Confidence falls the further ahead the outlook reaches.
  • No forecast is published for SO₂ at this station, although the station measures it.

Modelled hourly concentrations from the Copernicus Atmosphere Monitoring Service, published alongside the measurements in the EEA European Air Quality Index dissemination layer and classified with the same European AQI bands maqua.app applies to observations. maqua.app does not model air quality and does not adjust these values.

How the index is calculated

maqua.app provides general environmental information and does not replace medical advice or official emergency guidance.

Explain this reading

Explanations are general information, not medical advice. Every number on this page is calculated by the application itself and is unaffected.

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Where this reading comes from

Air-quality data provided by Malta's Environment and Resources Authority (ERA), disseminated via the European Environment Agency (EEA). maqua.app is an independent project and is not operated by, affiliated with, or endorsed by ERA or the EEA.

Each pollutant concentration is rounded to the nearest whole microgram per cubic metre and matched against the published band ranges. The location takes the band of its worst pollutant. A missing value is shown as unavailable and never as zero. Bands are calculated only from pollutants that actually reported.

This is not an official ERA or EEA service. For official statements, consult ERA directly.

Station detail

Station type
TrafficSited beside a busy road, so it records the higher end of local exposure.
Area
Urban
Island
Malta
Altitude
7 m above sea level
Coordinates
35.9448° N, 14.3857° E
Operated by
Environment & Resources Authority (ERA)

Station code: MT00009

All times are shown in Malta time.

All times are shown in Malta time. (Europe/Malta)