1 - 15 : Good / Blue
16 - 35 : Moderate / Green
36 - 75 : Poor / Orange
76 - : Very poor / Red
(Unit:  ㎛/㎥)

Particulate matters that are 2.5 micrometers and smaller are called PM2.5. 1/20 of the width of human hair, PM2.5 is known to be more hazardous than PM10. PiCOHOME provides real-time data of PM2.5 based on the following four levels in South Korea: ‘Good’, ‘Moderate’, ‘Poor’, and ‘Very Poor’. There is no distinguished level of ‘Good’ or ‘Poor’ available from the World Health Organization (WHO). For more information, please refer to the national environmental standards.
 

*Recommended National Air Quality standards: PM2.5 (annual mean/24-hour mean, ㎛/㎥)
WHO: 10/25, South Korea: 15/35, USA: 12/35, EU: 25/-, Japan: 15/35, China: 34/75

 

*Recommended National Indoor Air quality Standards of PM2.5 (㎛/㎥)
WHO: 10 (annual)/25(24h), South Korea: 35 (susceptible populations), USA (ASHRAE): 15 (annual), EU: 25 (annual), Taiwan: 35 (24h)

1 - 30 : Good / Blue
31 - 80 : Moderate / Green
81 - 150 : Poor / Orange
151 - : Very poor / Red
(Unit:  ㎛/㎥)

Particulate matters that are 10 micrometers and smaller are called PM10. It can cause lung disease by penetrating deep into the alveoli, thus  weakening the immune system. PiCOHOME provides real-time data of PM2.5 based on the following four levels in South Korea: ‘Good’, ‘Moderate’, ‘Poor’, and ‘Very Poor’. There is no distinguished level of ‘Good’ or ‘Poor’ available from the WHO. For more information, please refer to the national environment standards.
 

*Recommended National Air Quality Standards: PM10 (annual mean/24-hour mean, ㎛/㎥)
WHO: 20/50 South Korea: 50/100, USA: -/150, EU: 40/50, Japan: -/100, China: 70/150

 

*Recommended National Indoor Air Quality Standards of PM10 (㎛/㎥)
WHO: 20(annual)/50(24h), South Korea: 75(susceptible populations), USA (ASHRAE): 50 (annual), EU: 40 (annual)/50 (24h), Japan: 150 (24h, MHLW), 100 (24h, MEXT), Taiwan: 75 (24h)

1 - 249 : Good / Blue
250 - 449 : Moderate / Green
450 -  : Poor / Red
(Unit: ppb)

Volatile Organic Compounds (VOCs) are the liquid or gas form organic compounds that can easily evaporate in the air. Some organics are considered carcinogens and have analgesic effect by blocking central nerve system in high concentration while others can cause hypersensitivity in low concentration. PiCOHOME informs real-time data of VOCs in three different levels based on the article, “Environmental Health Perspective” (Satish et al. 2012).
 

To measure accurate values of VOCs, PiCOHOME requires a minimum of 20 minutes of adjustment time after it is turned on. The majority of countries have recommended standard units in ㎛/㎥. PiCOHOME uses parts per billion (ppb) as standard unit. It is difficult to say 1㎛/㎥ is equal to 1ppb.
 

*Recommended National Volatile Organic Compound Standards
WHO: South Korea: 400㎛/㎥, Japan: (temporary)400㎛/㎥, Taiwan: 560 ppb, German: managed into 5 different levels (1~300㎛/㎥, harmless).

400 - 800 : Good / Blue
801 – 1,000 : Moderate / Green
1,001 – 2,000 : Poor / Orange
2,001 - : Very Poor / Red
(Unit: ppm)

Carbon dioxide indoors can be produced during respiration process of human or during heating and cooking, and as its concentration spikes, it can cause drowsiness, fatigue, and lowered concentration. PiCOHOME follows four levels from DIN EN 13779:2007-9 of umweltbendesamt (UBA, Germany) to provide real-time carbon dioxide concentration. For more information, please refer to the national environment standards.
 

*Recommended National Indoor Carbon Dioxide Concentrations (ppm)
WHO: -, South Korea: 1,000, USA (ASHRAE): 1,000, Japan: 1,000, Taiwan: 1,000
Most of countries recommend maintaining indoor carbon dioxide concentrations at or below 1000ppm.

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