Modeled air-quality planning
Air quality in Colombo, Western Province, Sri Lanka: forecast and best time outside
Use this page to check the modeled air-quality outlook for Colombo, Western Province, Sri Lanka and compare practical periods before making an outdoor plan. The live card uses the same teaser-to-email flow as the main AirAgora tool; the factual context below comes from the licensed GeoNames city record.
- Population rank in directory
- #%!d(float64=884) of 2,500
- Population in source record
- 648,034
Current modeled outlook
Current modeled outlook for Colombo
AirAgora requests the current OpenWeather 1–5 category and source timestamp through the official API. The anonymous card stays concise, while the complete 24-hour comparison remains email-gated.
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GeoNames · CC BY 4.0
GeoNames facts for Colombo
These fields describe the GeoNames populated-place record associated with this page. They do not describe local pollution causes or typical conditions.
- Population in source record
- 648,034
- Population rank in directory
- #%!d(float64=884) of 2,500
- Population rank among included cities in this country
- #%!d(float64=1) of %!d(float64=1) included cities in Sri Lanka
- GeoNames administrative-area label
- Western Province
- IANA timezone
- Asia/Colombo · UTC+05:30
- Elevation / terrain model
- %!s(float64=7) m (DEM field)
- GeoNames coordinates
- 6.9355°, 79.8487°
- GeoNames record modified
- September 5, 2019
What the place facts mean for this page
AirAgora orders the selected cities by GeoNames population, using GeoNames ID only to break ties. On that basis, Colombo is number %!d(float64=884) with a source population of 648,034 in the 500,000–1 million range.
Colombo is the %!d(float64=1)-ranked included city for Sri Lanka; the corpus contains %!d(float64=1) qualifying cities from that country. Colombo belongs to the Asia region and lies in the Northern hemisphere.
The GeoNames DEM field reports %!s(float64=7) m (DEM field), which falls in the broad low-elevation range used in this directory. AirAgora does not infer pollution, climate, or personal exposure from elevation.
Local date, timezone, and clock behavior
Planning windows for Colombo use the IANA timezone Asia/Colombo. On this page's publication date, the local date is Sunday, July 19, 2026 and the UTC offset is UTC+05:30.
The January and July reference offsets are both UTC+05:30. No seasonal offset change appears in the 2026 reference check, although timezone rules can still change in future database releases.
Which provider air-quality scale is shown for Colombo?
AirAgora displays OpenWeather’s official air-pollution scale from 1 to 5. It is not labeled European AQI, U.S. AQI, or a local regulatory index.
The provider category is preserved for display. AirAgora derives continuous internal severity from documented pollutant concentration bands for ranking; that internal value is not a synthetic AQI or a promise of safety.
Modeled forecast and local limits
Colombo uses the OpenWeather modeled air-pollution forecast. The selected coordinate represents provider forecast data, not a street-level monitor, indoor measurement, or personal exposure estimate.
OpenWeather 1–5
The official provider category stays visible and is not relabeled as a regulatory AQI.
Pollutant severity
Internal scoring comes from documented concentration bands and is never presented as a synthetic AQI.
How to use the Colombo planner
Start with the live current-category teaser, choose the activity, then use the email reveal for a complete hourly comparison. AirAgora evaluates complete two-hour windows starting between 06:00 and 22:00 local time. It gives 70% of the score to mean severity and 30% to the worst hour, keeps an earlier window when scores are materially tied, and avoids naming a winner when the difference is too small.%!(EXTRA string=Colombo)
If every practical period remains in a poor category, the result is described as the least polluted available window rather than as good or safe. Missing hours, provider errors, and stale data remain visible instead of being filled with invented values.
Open the best-time-outside toolNearby cities in the validated corpus
Distances below are great-circle approximations between GeoNames city coordinates. They help navigate AirAgora's 2,500-city directory; they are not route distances and do not imply similar air conditions.
Questions about air quality in Colombo
Which air-quality scale does AirAgora show for Colombo, Western Province, Sri Lanka?
For Colombo, Western Province, Sri Lanka, AirAgora displays OpenWeather’s official air-pollution scale from 1 to 5. It is not labeled as European, U.S., or local regulatory AQI.
What timezone does the Colombo, Western Province, Sri Lanka forecast use?
The city record uses Asia/Colombo. Forecast timestamps and candidate windows are converted into that IANA timezone; the 2026 reference offset is UTC+05:30.
Is the Colombo, Western Province, Sri Lanka result a street-level measurement?
No. It is a modeled OpenWeather air-pollution forecast for the selected coordinate, not a street-level monitor. A nearby station, route, indoor space, or local event can differ.%!(EXTRA string=Colombo, Western Province, Sri Lanka)
Where does the population figure for Colombo, Western Province, Sri Lanka come from?
The page reports the GeoNames value of Colombo, Western Province, Sri Lanka and population rank %!d(string=648,034) in AirAgora's 2,500-city directory. It is source metadata, not a live population estimate.%!(EXTRA float64=884)
Which supported city pages are nearest to Colombo, Western Province, Sri Lanka?
The nearest city-directory pages are Colombo, Western Province, Sri Lanka. Distances use city coordinates and are approximate great-circle values, not driving routes.%!(EXTRA string=Thoothukudi (India), Tirunelveli (India), Thiruvananthapuram (India), Madurai (India))
What does “best time” mean for Colombo, Western Province, Sri Lanka?
It means the lowest deterministic score among complete practical two-hour windows returned for Colombo, Western Province, Sri Lanka. It does not mean risk-free, and when conditions are similarly poor AirAgora says so.%!(EXTRA string=Colombo, Western Province, Sri Lanka)
When was the Colombo, Western Province, Sri Lanka place record updated?
The GeoNames record carries the modification date Colombo, Western Province, Sri Lanka. Live air data has a separate provider update timestamp shown in the result card.%!(EXTRA string=September 5, 2019)
Sources, modification, and limits
Place name, administrative area, coordinates, timezone, population, elevation/DEM, feature code, and modification date come from GeoNames under CC BY 4.0. The GeoNames record used here was last modified on September 5, 2019. Live modeled air-pollution fields come from OpenWeather with visible attribution. AirAgora preserves the provider 1–5 category and separately derives, caches, and scores component severity.
