basement station indoor air quality measurement

• based reason : law No.12 of indoor air quality management(indoor air quality measurement)
• maintenance standard and the measured results(how often to measure: annually)

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  maintenance standard and the measured results

  (based on year 2024)
  division	fine dust (㎍/㎥)	ultrafine dust (㎍/㎥)	carbon dioxide (ppm)	form aldehyde (㎍/㎥)	carbon monoxide(ppm)
  standard	less than 100㎍/㎥	less than 50㎍/㎥	less than 1,000ppm	less than 100㎍/㎥	less than 10ppm
  average	29.7	19.6	520	8.7	0.4
  line1	27.7	20.3	522	7.1	0.3
  line2	28.3	17.1	480	4.6	0.6
  line3	27.9	16.3	540	8.9	0.4
  line4	35.2	24.9	540	14.3	0.4

• recommended standard & measured result(how often to measure: once every two years)

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  recommended standard & measured result

  (based on year 2023)
  division	nitrogen dioxide (ppm)	radon (Bq/m3)	volatile organic compounds (㎍/㎥)
  standard	less than 0.1	less than 148	less than 500
  average	0.017	12.0	128.2
  line 1	0.018	12.7	98.3
  line 2	0.020	9.1	183.5
  line 3	0.015	13.6	149.4
  line 4	0.018	12.8	81.9

Air quality measurement in the motor car

• based reason : Law No.9 article 2 of indoor air quality management(Measurement on Indoor Air Quality in Public Transportation Vehicles)
• measured result

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  measured result

  (based on year 2024)
  division	ultrafine dust (PM2.5)	carbon dioxide (CO2)
  standard	less than 50㎍/㎥	less than 2,000ppm(uncrowded)	less than 2,500ppm(crowded)
  average	7.3	1,421	1,518
  line1	10.2	1,364	1,556
  line2	5.0	1,314	1,341
  line3	7.8	1,592	1,654
  line4	6.1	1,413	1,523

efforts to improve air quality

ventilation facility operation for the clean environment

air screening device periodic filter cleaning

• As air filter device is installed in the air inlet and the air conditioner, outdoor air can go through the filter and fresh air come in the station
• period : auto cleaning(once a day), manual cleaning(once a month), high pressure cleaning (annually)

water washing in the ground tunnel

• periodic cleaning is a must for clean and fresh environment

enhancement and exchange of old ventilation facility

• ventilation fan exchange, station ventilation duct enhancement, air filtering device exchange