Outdoor Air Quality

PM 2.5

November 17, 2019

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PM 2.5 (µg/m³)

Updated on :
Average 24-hour Retrospective

PM 2.5 ((µg/m³))

  • 0.0 - 12.0

    Good

  • 12.1 - 35.4

    Moderate

  • 35.5 - 55.4

    Unhealthy for Sensitive group

  • 55.5 - 150.4

    Unhealthy

  • 150.5 - 250.4

    Very Unhealthy

  • 250.5 - 500

    Hazardous

  • 0.0 - 54.0

    Good

  • 55 - 154

    Moderate

  • 155 - 254

    Unhealthy for Sensitive group

  • 255 - 354

    Unhealthy

  • 355 - 424

    Very Unhealthy

  • 425 - 605

    Hazardous

About the Air Pollution Measurement

WHAT is PM ?

Credit : Environmental Protection Agency, United States of America

PM stands for particulate matter (also called particle pollution): the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye.

Particle pollution includes

PM 10 (µg/m 3 )

PM10 : inhalable particles, with diameters that are generally 10 micrometers and smaller

PM 2.5 (µg/m 3 )

PM2.5 : fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller.

How small is 2.5 micrometers ?

Think about a single hair from your head. The average human hair is about 70 micrometers in diameter – making it 30 times larger than the largest fine particle.

The table below defines the particulate matter scale as defined by the US-EPA 2016 standard

DISPLAY PM 2.5 (µg/m 3 , 24-hour average) PM 10 (µg/m 3 , 24-hour average) HEALTH IMPLICATIONS
Good
0.0 - 12.0 0 - 54 Air quality is considered satisfactory, and air pollution poses little or no risk
Moderate
12.1 - 35.4 55 - 154 Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for Sensitive group
35.5 - 55.4 155 - 254 Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy
55.5 - 150.4 255 - 354 Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects
Very Unhealth
150.5 - 250.4 355 - 424 Health warnings of emergency conditions. The entire populations is more likely to be affected.
Hazardous
250.5 - 500 425 - 605 Health alert: everyone may experience more serious health effects

WHAT is CO 2 ?

Credit : Environmental Protection Agency, United States of America: ScienceDaily

Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas and oil), solid waste, trees and other biological materials, and also as a result of certain chemical reactions (e.g., manufacture of cement).

The table below defines CO 2 level defined by the ASHRAE 62.1-2007 standard

DISPLAY CO 2
Normal < 1000 ppm

WHAT is VOCs ?

Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs include a variety of chemicals, some of which may have short- and long-term adverse health effects.

The table below defines TVOC level defined by the by the US-EPA standard

DISPLAY TVOC
Normal < 500 ppm
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