Fine dust

Air quality

Fair

Integrated Air Quality Index(CAI)

Fine dust Welli Hilli Park(Observation area : Jongno Observatory)

Fair

Fine dust (PM10)

36㎍/㎥

It's a good day to go out

Good

Ultrafine dust (PM2.5)

13㎍/㎥

It's a day without worrying about ultrafine dust

US AQI & WHO

US AQI WHO

Good

Fine dust (PM10)

36㎍/㎥

Fair

Ultrafine dust (PM2.5)

13㎍/㎥

Fine dust graph

Fine dust weekly graph

Air condition map

Now

10a

11a

Summary

Currently, the Integrated Environmental Atmosphere Index of Welli Hilli Park(Observation area : Jongno Observatory) is 72 and Fair. Please manage the air quality with indoor ventilation.

Pollutants

0.002

Good

NO₂ (Nitrogen dioxide)

0.002 ppm
0.037

Fair

O₃ (Ozone)

0.037 ppm
0.001

Good

SO₂ (Sulfur dioxide)

0.001 ppm
0.4

Good

CO (Carbon monoxide)

0.4 ppm

Pollutants Standard

Nitrogen dioxide Ozone Sulfur dioxide Carbon monoxide

Nitrogen dioxide

Nitrogen dioxide is a nitrogen compound air pollutant generated from industrial combustion and chemical processes. Exposure to high concentrations can negatively affect mucous membranes and bronchi and lungs.

Good

0.03

Fair

0.06

Bad

0.2

Very bad

0.201~

Integrated Air Quality Index(CAI)

· It is an air pollution expression method developed in consideration of the impact on the human body and perceived pollution level according to the air pollution level, in order to make it easier for the public to know the measured air pollution level and to present action guidelines to prevent damage from air pollution to the public.

Conditions	Detail
Good	(0 - 50) A level that does not cause an effect even in patients with air pollution-related diseases
Fair	(51 - 100) Levels that may cause minor effects in case of chronic exposure to the patient population
Bad	(101 - 250) A level that can cause harmful effects to patients and sensitive groups, and a level that the general public can experience discomfort in health
Very bad	(251 - 350) Serious effects upon acute exposure to patients and sensitive groups, level at which the general public may also be slightly affected
Very bad	(- 500) A level at which emergency measures may be taken for patients and sensitive groups, or the general public may be adversely affected

※Standard Unit : μg/m3 ※ offer : Ministry of Environment/Korea Environment Corporation

Fine dust

· Definition

- Dust smaller than 10mm in 1000 minutes

· Definition

- Dust smaller than 2.5/1000mm
- Particles smaller than the 1/20~1/30 size of a human hair diameter (approximately 60µm)

Ministry of Environment fine dust standards

Conditions	Fine dust	Ultrafine dust
Good	(0 - 30)	(0 - 15)
Fair	(31 - 80)	(16 - 35)
Bad	(81 - 150)	(36 - 75)
Very bad	(151 More)	(76 More)

※ Standard Unit: μg/m3 ※ Ministry of Environment ( Korea Environmental Policy Evaluation Institute ) standards

※ If data reception in your area is not smooth, information from nearby stations may be displayed.

US AQI(AirQualityIndex)

Conditions	Fine dust(PM10)	Ultrafine dust(PM2.5)
Good	(0 - 54)	(0 - 12)
Fair	(55 - 154)	(12.1 - 35.4)
Unhealthy for the Sensitive Groups	(155 - 254)	(35.5 - 55.4)
Bad	(255 - 354)	(55.5 - 150.4)
Very bad	(355 - 424)	(150.5 - 250.4)
Danger	(425 More)	(250.5 More)