Air quality comparison · South Korea, 121 km apart
Daegu vs Daejeon Air quality index (AQI) today
Daegu has cleaner air than Daejeon right now: AQI 75 (Moderate) against 79 (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, Daegu averaged AQI 62 against 63, and it was the cleaner of the two on 4 of those days. Daegu has lost more forest since 2001. Daejeon has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Daegu75Daejeon79
Head to head
Daegu vs Daejeon at a glance
Daegu and Daejeon are level, each ahead on 3 of 6 measures. The better figure in each row is marked.
| Daegu | Daejeon | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 75 (better) | 79 |
| PM2.5Fine particles, µg/m³. | 22 (better) | 24 |
| Past week's averageUS AQI, 7 days. | 62 (better) | 63 |
| Forest lost since 2001Within 10 km of the center. | 354 ha | 191 ha (better) |
| Tree coverWithin 2 km of the center. | 3.6% | 13.6% (better) |
| Trees still neededTo reach a healthy canopy. | 82.3K | 51.3K (better) |
Air quality today
What is the air like in Daegu and Daejeon right now?
Daegu has cleaner air than Daejeon right now: AQI 75 (Moderate) against 79 (Moderate). PM2.5 is setting the index in both.
Daegu's PM2.5 is about 1.5× the WHO's 24-hour guideline of 15 µg/m³. Daejeon's PM2.5 is about 1.6× the WHO's 24-hour guideline of 15 µg/m³.
Both readings come from nearby ground stations.
DaeguDaejeon
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).
Daegu: Ground station · 수창동, 800 m away · median of 20 stations. Data: OpenAQ · Korea Air Ministry of Environment, Korea Environment Corporation · AirKorea.
Daejeon: Ground station · 둔산동, 600 m away · median of 14 stations. Data: OpenAQ · Korea Air Ministry of Environment, Korea Environment Corporation · AirKorea.
The past week
Which had cleaner air over the past 7 days?
Over the past 7 days, on modeled daily averages, Daegu averaged AQI 62 against 63, and it was the cleaner of the two on 4 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
- Daegu4Daejeon3
- Average AQI
- Daegu62Daejeon63
- Worst day, AQI
- Daegu77Daejeon84
The daily numbers (7 days)
| Day | Daegu | Daejeon |
|---|---|---|
| Nov 5 | 77 | 66 |
| Nov 6 | 46 | 47 |
| Nov 7 | 49 | 53 |
| Nov 8 | 70 | 66 |
| Nov 9 | 66 | 62 |
| Nov 10 | 55 | 65 |
| Nov 11 | 72 | 84 |
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 Daegu and Daejeon 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 Daegu and Daejeon compare with the rest of the world?
Right now Daegu's air is cleaner than 34% of the 5,420 places Airleaf tracks, and Daejeon's is cleaner than 31%. Within South Korea, that is 56% and 47% of its 56 measured places.
Cleaner air than…
- Daegu
- Beats 34%
- Daejeon
- Beats 31%
More tree cover than…
- Daegu
- Beats 7%
- Daejeon
- Beats 31%
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, Daegu or Daejeon?
Daegu has lost more: about 354 ha of forest within 10 km of its center from 2001 to 2025, against 191 ha around Daejeon. 132 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.
Worst year: 2025, with 163 ha lost.
Worst year: 2020, with 23 ha lost.
| Daegu | Daejeon | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 354 ha | 191 ha (better) |
| Share of its forestOf what it had in 2000. | 3.7% | 2.2% (better) |
| Cleared for goodTurned into farms, mines or towns. | 132 ha | 121 ha (better) |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (37%) | Towns and roads (62%) |
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.
Daegu
2017: satellite photo from June 2017 of a 5 × 5 km area about 7 km north of the city center.
Daejeon
2017: satellite photo from June 2017 of a 5 × 5 km area about 7 km northeast of the city center.
Trees
Which has more trees, Daegu or Daejeon?
Daejeon has more tree cover: 13.6% of the land within 2 km of its center against 3.6% around Daegu, or about 42,512 trees against 11,219.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Daegu | Daejeon | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 11.2K | 42.5K (better) |
| Trees still neededTo reach the target. Fewer is better. | 82.3K | 51.3K (better) |
| CO₂ absorbed each yearBy the trees already standing. | 247K kg | 935K 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
Daegu vs Daejeon: your questions answered
Is Daegu cleaner than Daejeon?
On air quality, yes, right now: Daegu reads AQI 75 against 79, a gap of 4 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, Daegu averaged AQI 62 against 63, and it was the cleaner of the two on 4 of those days.
Is it safe to exercise outdoors in Daegu and Daejeon today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Daegu reads AQI 75 and Daejeon reads AQI 79.
Which has lost more forest, Daegu or Daejeon?
Daegu has lost more: about 354 ha of forest within 10 km of its center from 2001 to 2025, against 191 ha around Daejeon. 132 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Daegu or Daejeon?
Daejeon has more tree cover: 13.6% of the land within 2 km of its center against 3.6% around Daegu, or about 42,512 trees against 11,219. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Daegu and Daejeon need?
Daegu needs about 82,275 more to reach its canopy target of 30%, and Daejeon about 51,265 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Daegu and Daejeon 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 come from nearby ground stations. Nothing is adjusted for population, city limits or climate.
How often does the Daegu vs Daejeon 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 12, 2026 and Sep 8, 2026), and the forest figures are published yearly.
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