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Air Pollution

How Useful Is The Air Quality Index?

From haze shrouding Southeast Asia for decades to Delhi’s recent acrid smog, a toxic tide of air pollution is choking cities worldwide

How Useful Is The Air Quality Index?
An air quality index is a useful tool, but it has limitations

Kuala Lumpur: While the air quality index is a useful tool, it has its limitations. There’s still a greater need for robust monitoring to ensure cleaner air. Imagine you’re walking through polluted city streets. Despite wearing a N95 mask, you can still smell the smoky, sulphuric, gassy, solvent-like air. The pollution is so bad you can even taste the air’s oily, dirty residue. The skyline is obscured by a thick layer of smog, transforming the horizon into a hazy, fog-laden panorama.

From the annual transboundary haze shrouding Southeast Asia for decades to Delhi’s recent acrid smog, a toxic tide of air pollution is choking cities worldwide.

Also Read: An Invisible Killer Hangs In The Air Of Asia’s Cities

Beijing’s winter smog, a noxious cocktail of traffic fumes and factory spew, paints a horrifying picture: this invisible enemy isn’t a distant threat, it’s in the air we breathe.

The main sources of these air pollutants are exhaust emissions, incomplete combustion of fossil fuels, power stations and industrial activities, all of which result in harmful chemicals and pollutants blanketing the air.

Air pollutants are categorised as primary pollutants (environmentally damaging materials produced by man-made or natural processes) and secondary pollutants (products of chemical changes of the primary pollutants).

Usually colourless and odourless, air pollutants are an invisible threat which poses a grave risk to public health, our ecosystems, and the delicate equilibrium of our planet.

A way to keep track of air pollution daily is by understanding how to minimise our exposures using readings of the Air Quality Index (AQI), also sometimes referred to as Air Pollution Index (API).

This is the global language used for assessing air quality conditions. It informs people how clean or polluted the air is based on a simple number from a scale of 0-500 with known impact to human health.

Thirty-seven of the 40 most polluted cities in the world are in Southeast Asia with almost 99 percent of the population living in areas where the WHO has deemed the air quality to be unsafe due to pollution.

Our health is intricately linked to what we breathe. Just like smoking, breathing unclean air is equally bad. Just like how smoking is bad for our health, breathing in unclean air is equally bad.

Also Read: GRAP’s Stage-3 Restrictions Invoked In Delhi As Air Quality Dips To ‘Severe’ Category

Polluted air particles can cause irritation, swelling and inflammation in our nose, throat, sinuses, eyes and in our lungs. Gut microbiota is also affected. For babies and children with developing lungs, people living with pre-existing medical conditions such as heart disease, people with disabilities, and the elderly, poor quality air can have serious and lasting implications such as emphysema, asthma, chronic obstructive pulmonary disease and even some cancers such as lung, breast and pancreatic cancers.

The number on the scale is based on concentrations of chemical pollutants of any given day into one reading. The reading takes account of all the major air pollutants, including particulate matter, ground level ozone, carbon monoxide, sulphur dioxide and nitrogen dioxide.

Daily reading allows the government and the public to understand the air quality surrounding them and when the air quality is at its best or worst, helping people to make their own choices about when to venture out or avoid going out.

An air quality index is useful in indicating the condition of air quality which reflects the effect on human health and is easily understood by the public. Each index value corresponds to a colour-coded category and specific health risks.

Five major pollutants are used in calculating air quality. The calculation is based on the Pollution Standard Index (PSI) that has been used and accepted internationally. It involves measuring pollutant concentrations, applying specific formulas, and interpreting the results to provide a simple, colour-coded scale.

API Guide The continuous air quality monitoring stations record hourly concentrations of the major pollutants. Following their different averaging time, the concentrations of each primary pollutant is converted into a sub-index using a specific mathematical equation following the requirement of country specific ambient air quality standards breakpoints.

Also Read: Improvement In Delhi’s Air Quality Since 2015-17 Halted In 2023: CSE Report

These standards are the Malaysian Ambient Air Quality Standard (MAAQS) for Malaysia, the National Ambient Air Quality Standard (NAAQS) in the US, and the National Environmental Protection (Ambient Air Quality) Measure (NEPM) in Australia.

When a specific sub-index for each primary pollutant is calculated, the highest sub-index is determined as the air quality for the particular time period.

An air quality index is a useful tool, but it has limitations. Index values can differ from country to country due to variable emission sources, meteorological conditions and environmental regulation and enforcement.

The specific formulas used to convert their concentrations into sub-indexes can differ in the weighting of the pollutants, the different standard breakpoints used in different countries, which means the same concentration of a pollutant might trigger a higher or lower sub-index depending on the local standards.

As the air quality index focuses on five primary pollutants, it may not capture emerging threats like ultrafine particles which can penetrate deeper into our lungs and bloodstream.

These ultra fine particles can cause various health impacts.

They are volatile organic compounds which contribute to formation of surface ozone; and airborne heavy metals like lead, arsenic and chromium which can cause damage to organs and nervous system.

An index gives an overall number and does not take into account how different people’s exposure can be depending on things like where they are and how active they are.

Also Read: Noida Recorded Best Average Air Quality Index In Seven Years In 2023: Data

While the air quality index provides a valuable metric for quantifying air pollution and its public health implications, there are limitations.

By advocating for stricter regulations, adopting sustainable practices and encouraging collective action, we can claim our right to clean air — a lifeline not only for our lungs, but also for the future of our planet and its diverse inhabitants.

(This story has not been edited by NDTV staff and is published from a syndicated feed.)

NDTV – Dettol have been working towards a clean and healthy India since 2014 via the Banega Swachh India initiative, which in its Season 10 is helmed by Campaign Ambassador Ayushmann Khurrana. The campaign aims to highlight the inter-dependency of humans and the environment, and of humans on one another with the focus on One Health, One Planet, One Future – Leaving No One Behind. It stresses on the need to take care of, and consider, everyone’s health in India – especially vulnerable communities – the LGBTQ populationindigenous people, India’s different tribes, ethnic and linguistic minorities, people with disabilities, migrants, geographically remote populations, gender and sexual minorities. In a world post COVID-19 pandemic, the need for WASH (WaterSanitation and Hygiene) is reaffirmed as handwashing is one of the ways to prevent Coronavirus infection and other diseases. The campaign will continue to raise awareness on the same along with focussing on the importance of nutrition and healthcare for women and children, fight malnutrition, mental well-being, self-care, science and health, adolescent health & gender awareness. Along with the health of people, the campaign has realised the need to also take care of the health of the eco-system. Our environment is fragile due to human activity, which is not only over-exploiting available resources, but also generating immense pollution as a result of using and extracting those resources. The imbalance has also led to immense biodiversity loss that has caused one of the biggest threats to human survival – climate change. It has now been described as a “code red for humanity.” The campaign will continue to cover issues like air pollutionwaste managementplastic banmanual scavenging and sanitation workers and menstrual hygiene. Banega Swasth India will also be taking forward the dream of Swasth Bharat, the campaign feels that only a Swachh or clean India where toilets are used and open defecation free (ODF) status achieved as part of the Swachh Bharat Abhiyan launched by Prime Minister Narendra Modi in 2014, can eradicate diseases like diahorrea and the country can become a Swasth or healthy India.

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