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The guidelines stipulate that PM 2.5 should not exceed 5 μg/m 3 annual mean, or 15 μg/m 3 24-hour mean; and that PM 10 should not exceed 15 μg/m 3 annual mean, or 45 μg/m 3 24-hour mean. [2] For ozone (O 3 ), the guidelines suggest values no higher than 100 μg/m 3 for an 8-hour mean and 60 μg/m 3 peak season mean. [ 2 ]
The World Health Organization's recommended limit is 10 micrograms per cubic meter, although there are also various national guideline values, which are often much higher. Air pollution is among the biggest health problems of modern industrial society and is responsible for more than 10 percent of all deaths worldwide (nearly 4.5 million ...
Particulate matter (PM) is generally classified into two main size categories: PM 10 and PM 2.5. PM 10, also known as coarse particulate matter, consists of particles 10 micrometers (μm) and smaller, while PM 2.5, also called fine particulate matter, consists of particles 2.5 μm and smaller. [29]
[6] [5] Thailand's national standards for PM2.5 air quality were revised in 2022 and 2023, to adopt the World Health Organization (WHO) Interim Target 3 (IT-3) of 37.5 μg/m 3 and 15 μg/m 3 for 24 hour and annual measures, respectively. [7] [8] [9] In 2023, over 10 million Thais sought treatment for air pollution-related illnesses. [10]
The CCME standard for particulate matter 2.5 (PM 2.5) as of 2015 is 28 μg/m 3 (calculated using the 3-year average of the annual 98th percentile of the daily 24-hr average concentrations) and 10 μg/m 3 (3-year average of annual mean). PM 2.5 standards will increase in stringency in 2020. [273]
The level of lead in her daughter Zoe’s blood was alarmingly high at 21 micrograms per deciliter — an amount four times the Centers for Disease Control and Prevention threshold of 5 micrograms per deciliter.
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore, which is a number used to indicate the level of pollutants in air.Initially PSI was based on five air pollutants, but since 1 April 2014 it has also included fine particulate matter (PM 2.5).
These viral $2.99 Trader Joe’s tote bags are being resold for as much as $500 on eBay. ... Although some stores have reportedly been placing limits on the amount people are able to buy at one ...