World Lung Day | Air is deadlier than we thought it is!

jakarta air pollution

While we observe World Lung Day, let us also pay heed to the latest policy guidelines on one of the major preventable risk factors of deadliest of lung diseases: air pollution. The World Health Organization (WHO) has released its latest Air Quality Guidelines that after rigorous scientific review has lowered the maximum upper limit of six top deadly air pollutants. After thorough scientific analysis of all data emerging from around the world, the latest WHO Air Quality Guidelines has slashed the maximum upper cap on each of these deadly pollutants, compared to the maximum limit set 16 years ago (as per the 2005 WHO Air Quality Guidelines).

These six air pollutants are: Particulate Matter (PM) 2.5 micrometer (microns), PM 10 micrometer (microns), Ozone, Sulphur Di-Oxide, Nitrogen Di-Oxide, and Carbon Monoxide.

Air pollution kills over 7 million people every year

The latest WHO Air Quality Guidelines provide clear evidence of the damage air pollution inflicts on human health, at even lower concentrations than previously understood. Cardiovascular diseases (CVDs) are the world’s biggest killers, and air pollution is among the preventable causes of CVDs. Lung cancer is the deadliest of cancers, and no surprise that air pollution is among the preventable causes of it.

The WHO confirmed that every year, air pollution causes 7 million untimely deaths and result in the loss of millions more healthy years of life. In children, this could include reduced lung growth and function, respiratory infections and aggravated asthma. In adults, ischaemic heart disease and stroke are the most common causes of untimely death attributable to outdoor air pollution, and evidence is also emerging of other effects such as diabetes and neurodegenerative conditions. This puts the burden of disease attributable to air pollution on a par with other major global health risks such as unhealthy diet and tobacco smoking.

That is why the latest WHO 2021 Air Quality Guidelines recommend new air quality levels to protect the health of populations, by reducing maximum levels of the six lethal air pollutants, some of which also contribute to climate change.

According to the 2021 WHO Air Quality Guidelines, PM2.5 maximum levels are 5 (yearly average), which is half of what it was set as per the 2005 WHO guidelines.

PM10 levels in 2021 have a maximum cap at 15 (in 2005, the max cap was 20 for annual average).

Nitrogen Di-Oxide level maximum cap as per latest WHO guidelines is at 10 yearly average which is 10 times lower than what it was set in 2005.

Maximum cap on Sulphur Di-Oxide levels have also been slashed from 100 in 2005 to 40 in 2021.

Carbon Monoxide maximum levels are set at 4 (daily average), and maximum cap on Ozone levels as per the 2021 WHO Guidelines is 100 (8 hourly average).

According to the WHO, since its last 2005 update, there has been a marked increase of evidence that shows how air pollution affects different aspects of health. For that reason, and after a systematic review of the accumulated evidence, WHO has adjusted almost all the Air Quality Guideline levels downwards, warning that exceeding the new air quality guideline levels is associated with significant risks to health.

By striving to achieve these guideline levels, countries will be both protecting health as well as mitigating global climate change. When action is taken on these so-called classical pollutants – particulate matter (PM), ozone (O₃), nitrogen dioxide (NO₂) sulfur dioxide (SO₂) and carbon monoxide (CO), it also has an impact on other damaging pollutants.

Outdoor air pollution and Particulate Matter are carcinogens

Particulate Matter (PM) is primarily generated by fuel combustion in different sectors, including transport, energy, households, industry, and from agriculture. In 2013, outdoor air pollution and particulate matter were classified as carcinogenic by WHO’s International Agency for Research on Cancer (IARC).

Particulate Matter (PM), refers microscopic solids or liquid droplets that are so small that they can be inhaled and cause serious health problems. Both PM2.5 and PM10 are capable of penetrating deep into the lungs but PM2.5 can even enter the bloodstream, primarily resulting in cardiovascular and respiratory impacts, and also affecting other organs.

The more exposed to air pollution they are, the greater the health impact, particularly on individuals with chronic conditions (such as asthma, chronic obstructive pulmonary disease, and heart disease), as well as older people, children and pregnant women.

In 2019, more than 90% of the global population lived in areas where concentrations exceeded the 2005 WHO air quality guideline for long term exposure to PM2.5. More alarming is the reality that in 2019, India’s Particulate Matter concentration was 70.3 microns 0 the highest in the world and 7 times the old 2005 WHO’s guideline of 10.

Almost 80% of deaths related to PM2.5 could be avoided in the world if the current air pollution levels were reduced to those proposed in the updated guideline, according to a rapid scenario analysis performed by WHO.

While air quality has markedly improved in high-income countries over this period, it has generally deteriorated in most low- and middle-income countries, in step with large-scale urbanization, extractive industries, and so-called ‘economic development’ which is actually not only impoverishing majority of the people (and making tiny tycoons richer), but also poisoning our planet.

Air pollution reduces life expectancy of over 40% Indians by more than 9 years

Last month in August 2021, Energy Policy Institute of the University of Chicago had reported its research findings: Air pollution is likely to reduce the life expectancy of over 40% Indians by more than 9 years, with Delhi and Uttar Pradesh states reported to be worst-affected ones in the country. Delhi residents will lose 9.7 years of their lives due to air pollution, while those in Uttar Pradesh will lose 9.5 years of life expectancy. Last month it was reported that annual average PM2.5 level in cities of Uttar Pradesh was more than 12 times than the old WHO guideline limit. Residents of the city I live in (Lucknow) are expected to lose 11.1 years of their life expectancy due to air pollution.

Business as usual is killing us!

The price of inaction by governments around the world is mountainous resulting in unnecessary human suffering, untimely deaths, and irreparable damage to our planet due to air pollution. Will governments dump the so-called ‘development model’ which not only plunders our air and natural resources but also is resulting in humanitarian crises for majority of our population? Will governments reject false solutions promoted by extractive and fossil fuel industries, hold these abusive corporations to account, and go for real people-centric solutions to save our health and our planet?

Bobby Ramakant – CNS (Citizen News Service)

(Bobby Ramakant is a World Health Organization (WHO) Director General’s WNTD Awardee 2008 and part of CNS (Citizen News Service) and Asha Parivar teams. Follow him on Twitter @BobbyRamakant or visit

–       Shared under Creative Commons (CC)

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