Air quality comparison · South Sudan, 645 km apart
Winejok vs Yei Air quality index (AQI) today
Yei has cleaner air than Winejok right now: AQI 62 (Moderate) against 86 (Moderate).
Both sit in the same EPA band, so the health advice is the same for each today. Over the past 7 days, on modeled daily averages, Yei averaged AQI 63 against 78, and it was the cleaner of the two on 6 of those days. Yei has lost more forest since 2001. Yei has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Winejok86Yei62
Head to head
Winejok vs Yei at a glance
Yei is ahead on 5 of 6 measures, and Winejok on 1. The better figure in each row is marked.
| Winejok | Yei | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 86 | 62 (better) |
| PM2.5Fine particles, µg/m³. | 31 | 12.8 (better) |
| Past week's averageUS AQI, 7 days. | 78 | 63 (better) |
| Forest lost since 2001Within 10 km of the center. | under 1 ha (better) | 3,700 ha |
| Tree coverWithin 2 km of the center. | 4.7% | 34.4% (better) |
| Trees still neededTo reach a healthy canopy. | 79.5K | 0 (better) |
Air quality today
What is the air like in Winejok and Yei right now?
Yei has cleaner air than Winejok right now: AQI 62 (Moderate) against 86 (Moderate). PM2.5 is setting the index in both.
Winejok's PM2.5 is about 2.1× the WHO's 24-hour guideline of 15 µg/m³.
Both readings are model estimates, with no ground station close enough to either.
WinejokYei
Concentrations at the same moment as the index above, for the pollutants both places report. Lower is better. The dark marks on the PM2.5 and PM10 rows show the WHO's 24-hour guidelines (15 and 45 µg/m³).
Winejok: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
Yei: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
The past week
Which had cleaner air over the past 7 days?
Over the past 7 days, on modeled daily averages, Yei averaged AQI 63 against 78, and it was the cleaner of the two on 6 of those days. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Winejok0Yei6
- Average AQI
- Winejok78Yei63
- Worst day, AQI
- Winejok96Yei69
The daily numbers (7 days)
| Day | Winejok | Yei |
|---|---|---|
| Nov 5 | 73 | 54 |
| Nov 6 | 68 | 68 |
| Nov 7 | 79 | 69 |
| Nov 8 | 96 | 60 |
| Nov 9 | 95 | 61 |
| Nov 10 | 66 | 64 |
| Nov 11 | 66 | 65 |
Daily averages from the CAMS atmospheric model for both places, so the week compares like with like. They can differ from today's reading at the top of the page wherever that comes from a ground station.
What it means today
Is it safe to go outside in Winejok and Yei today?
Unusually sensitive people should consider limiting long outdoor exertion. Both are in the same EPA band today (Moderate), so the advice is the same.
Exercise outdoors
Fine for most people; unusually sensitive people should take long or hard exercise easier.
Windows
Fine to open; close them if you are sensitive to pollution.
Masks
Not needed for most people.
Air purifier
Worth running if you are sensitive.
Against everywhere else
How do Winejok and Yei compare with the rest of the world?
Right now Winejok's air is cleaner than 27% of the 5,420 places Airleaf tracks, and Yei's is cleaner than 45%. Within South Sudan, that is 25% and 75% of its 5 measured places.
Cleaner air than…
- Winejok
- Beats 27%
- Yei
- Beats 45%
More tree cover than…
- Winejok
- Beats 10%
- Yei
- Beats 76%
Includes model estimates as well as station readings, so it can differ from our most polluted and cleanest air rankings, which use station readings only.
Deforestation · 2001–2025
Which has lost more forest, Winejok or Yei?
Yei has lost more: about 3,700 ha of forest within 10 km of its center from 2001 to 2025, against under 1 ha around Winejok. 1,820 ha of that was cleared for good, for farms, mines or towns.
Measured within 10 km of each center, from the yearly satellite maps of forest loss: a wider circle than the one for tree cover, because forest is usually lost at a city's edges.
No forest lost in any year.
Worst year: 2008, with 595 ha lost.
| Winejok | Yei | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | under 1 ha (better) | 3,700 ha |
| Cleared for goodTurned into farms, mines or towns. | under 1 ha (better) | 1,820 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Speeding up |
| Main known cause | Not classified | Shifting farming (51%) |
Satellite timelapses
Watch both change, year by year
A clear satellite photo a year of the land around each city. Press play, turn on the forest cleared since the first year, or drag the before and after.
Winejok
2017: satellite photo from January 2017 of a 5 × 5 km area in the city center.
Yei
2017: satellite photo from January 2017 of a 5 × 5 km area about 6 km south of the city center.
Trees
Which has more trees, Winejok or Yei?
Yei has more tree cover: 34.4% of the land within 2 km of its center against 4.7% around Winejok, or about 108,071 trees against 14,765.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Winejok | Yei | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 14.8K | 108K (better) |
| Trees still neededTo reach the target. Fewer is better. | 79.5K | 0 (better) |
| CO₂ absorbed each yearBy the trees already standing. | 325K kg | 2.4M kg (better) |
Tree cover on the satellite image
The same 2 km radius around each center, with the tree cover the satellite found marked on it.
Reading these numbers
How this comparison is made
Air quality index
The US EPA index, computed from current pollutant concentrations: ground stations where a place has them nearby, and the CAMS atmospheric model everywhere else. It moves hour to hour, so it is a snapshot rather than a verdict on either place. The guideline marks are from the WHO's 2021 air quality guidelines.
Trees and forest
Tree cover is the share of ground under canopy within 2 km of each center, read from Sentinel-2 satellite imagery at 10 m detail. It measures that circle, not the whole municipality, which is what makes the two comparable. Forest loss comes from the University of Maryland's Global Forest Change maps.
More on the method on the About Airleaf page.
Frequently asked
Winejok vs Yei: your questions answered
Is Yei cleaner than Winejok?
On air quality, yes, right now: Yei reads AQI 62 against 86, a gap of 24 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. Over the past 7 days, on modeled daily averages, Yei averaged AQI 63 against 78, and it was the cleaner of the two on 6 of those days.
Is it safe to exercise outdoors in Winejok and Yei today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Winejok reads AQI 86 and Yei reads AQI 62.
Which has lost more forest, Winejok or Yei?
Yei has lost more: about 3,700 ha of forest within 10 km of its center from 2001 to 2025, against under 1 ha around Winejok. 1,820 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Winejok or Yei?
Yei has more tree cover: 34.4% of the land within 2 km of its center against 4.7% around Winejok, or about 108,071 trees against 14,765. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Winejok and Yei need?
Winejok needs about 79,482 more to reach its canopy target of 30%, and Yei about 0 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Winejok and Yei measured the same way?
The method is the same: the US EPA index for air, and Sentinel-2 satellite imagery at 10 m detail over an identical radius for trees. Both readings are model estimates, with no ground station close enough to either. Nothing is adjusted for population, city limits or climate.
How often does the Winejok vs Yei comparison update?
The air readings refresh about once an hour, and each reading's local time is shown at the top of the page. Tree cover comes from the latest clear satellite image of each area (Sep 19, 2026 and Aug 31, 2026), and the forest figures are published yearly.
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