Features
Tear Gas: What you need to know
By Prof.Kirthi Tennakone,
National Institute of Fundamental Studies
We hear incidents of tear gas deployment somewhere almost every day and too frequently in Sri Lanka these days. The Police direct tear gas shells to crowds they determine as unruly. The tactic serves the purpose of avoiding the bullet, or other lethal methods of combat, to deter an emotionally agitated mob about to engage in a criminal offence. However, indiscriminate use of tear gas poses health risks hard to ignore.
The United Nations Human Rights Commission has classified tear gas as a less – lethal weapon, and said that even less-lethal weapons must be employed only when they are subject to strict requirement of necessity and proportionality, in situations in which other less harmful measures have proven to be clearly ineffective to address the threat.
Amnesty International states: Tear gas may only be used in situations of more generalized violence for the purpose of dispersing a crowd, and only when all the other means have failed to contain the violence. It may only be used when people have opportunity to disperse and not when they are in a confined space or where roads or other routes of escape are blocked. People must be warned that these means will be used, and they must be allowed to disperse. Cartridges with chemical irritants may never be fired directly at any person. If used, repeated or prolonged exposure should be avoided and decontamination procedures should be followed immediately.
What is tear gas?
At the time of World War I, parties in conflict conducted intense research to develop new chemical weapons to evade restrictions imposed by The Hague Convention of 1899, forbidding deployment of projectiles containing poisonous gases – arguing non-lethal repellents do not fall into the category of poisons.
The Nobel laureate British Chemist William Ramsay suggested that relatively innocuous substances, similar to the ingredient named acrolein present in smoke, bringing tears to eyes (known as lachrymators), would ideally serve the purpose. In 1914, France used a synthetic lachrymator for the first time to expel German troops stationed in trenches. Subsequently, the Geneva Protocol of 1925 restricted use of chemical and biological agents in war, and finally, the United Nations, Chemical Weapons Treaty of 1993 banned tear gas in warfare. However, use of tear gas as a riot control agent in domestic situations was not restricted.
The tear gas compound widely used today is chlorobenzal malononitrile, conventionally referred to as CS gas – an abbreviation derived from the first letter of the surnames of two American chemists, Ben Carson and Roger Stoughton, who synthesized the compound first. Calling it a gas is a misnomer, because CS is actually a white solid material. On the firing of a tear gas shell, fine particles of CS disperse in the atmosphere as smog. The shell consists of a canister filled with a solution of CS in a volatile liquid. The heat of the burning gun powder, vaporizes the solvent, releasing smog from the propelling shell. In an alternative method, a pyrotechnic mixture is burnt to disperse CS as smoke
The minute aerosol particles of CS irritate the mucous membrane of eyes, mouth and respiratory track inducing a burning sensation. The effect is transient and relieved after a while, unless the victim is oversensitive or the exposure has been heavy.
Health Hazards of Tear Gas
Tear gas is ‘officially’ considered to be safe and only induces short-term effects, such as tearing from eyes, cough and throat irritation, sneezing, chest tightness and shortness of breath. These symptoms develop within few seconds of exposure and disappear in tens of minutes, provided the affected individual moves to uncontaminated atmosphere. Nevertheless, statistically significant adverse events have been reported – respiratory failure and death, severe allergies and eye injuries leading to blindness. Prolonged exposure and high doses increase the probability of such happenings. Dangers are greatest when tear gas is released into enclosed spaces or when the smog enters buildings.
The American Lung Association warns tear gas can cause chemical burns, allergic reactions and respiratory distress. People with pre-existing respiratory conditions such as asthma and chronic obstructive pulmonary disease, have higher risk of developing severe symptoms.
Thelong-term effects of tear gas exposure have not been evaluated sufficiently. Here, details are scanty and based on deplorably cruel experiments where monkeys are subjected to tear gas inhalation. In one such experiment, monkeys confined to an enclosed space have been exposed to a heavy dose of tear gas. Animals developed lung lesions and pneumonia and many died within few weeks. Recent investigations reveal that even at normal levels of exposure, clinically noticeable respiratory complications, sometimes continue for several weeks.
Concerns have been raised that tear gas may be mutagenic and clastogenic – meaning it can disturb and alter DNA, inducing cancer. The issue remains controversial as laboratory tests have yielded positive as well as negative results. The molecule of the lachrymator chlorobenzal malononitrile contains a covalently linked chlorine atom and classified as an organic- chlorine compound. Substances of this category and their degradation products are generally poisonous and sometimes carcinogenic.
The tear gas industry is a flourishing business; because of the heavy demand, unregulated products could enter the market. The extreme toxicity of unknown chemicals present as impurities is not ruled out. International law requires that non-lethal weapons and materials be tested independently of the manufacture’s specifications. In reality, testing of tear gas products would not be easy.
Tear gas and COVID
Exposure to tear gas could increase the rate of transmission of COVID-19 from those infected and also enhance the susceptibility to the illness when exposed to the virus. Coughing and sneezing after exhalation of tear gas releases more of the pathogen from those carrying it. The virus establishes easily when the mucus membrane gets irritated by the tear gas smog. Yet, crowds protesting against compulsory COVID control measures have been tear gassed. In 2020, the American Thoracic Society called for a moratorium on use tear gas and other chemical weapons.
Banning tear gas?
Human rights activists and legislators worldwide have voiced their opposition to indiscriminate use of tear gas. Some have demanded a complete ban, while other argue for restricted use. The general consensus is that tear gas should not be directed at peaceful demonstrators, because every man or woman has right to protest.
The world seems to be yet unready to impose a total ban of tear gas. It is an effective, less-lethal way of curbing emergence of riot behavior in a crowed. If tear gas is unavailable, law enforcement personnel would circumstantially resort to standard lethal methods of intervention. Tear gas cannot distinguish between wrong doers and peaceful persons or between leaders and participants; but gun, which can, would be far more dangerous. Tear gassing sometimes provokes violence, but rarely allow pinpointed individual vindictive action. What is needed at this juncture is; legislation to regulate tear gas use and educating law enforcement personnel.
Author can be reached via Email: ktenna@yahoo.co.uk
Features
Polarizing rhetoric greets America on its epochal anniversary
Democratic and progressive opinion in the US and the world over would likely have been further jolted by the divisive rhetoric blared forth by US President Donald Trump on no less an occasion than the 250th anniversary of the US Declaration of Independence from Britain. The world has been placed on notice that what it would be having in the main is aggravated polarization on multiple fronts during what’s left of the Trump tenure.
If the world was expecting positive moves by the Trump administration to bridge divisions, heal rifts and usher in a more harmonious international political order, this is very unlikely to be. Instead, in all probability we would be left with a far more ‘dangerous place to live in’.
Some of the more thought-provoking recent ‘takes’ from President Trump are : ‘A generation after we fought and won the cold war against the menace of communism, there is now a resurgence of the communist menace in our land, including from newcomers to our country who embrace ideas totally opposed to our way of life and our great success.’ ‘We will send them (immigrants) quickly away, and we will continue to build our country bigger and better than ever before.’ ‘We are going to give our country its identity back.’ ‘You can be loyal to Karl Marx or you can be loyal to America. You can be a communist or you can be a patriot. You cannot be both.’
Accordingly, what the world would have in increasing measure going forward are stepped-up attempts to consolidate a white supremacist administration in the US accompanied by a suppression of ethnic, religious and cultural minorities at home along with renewed attempts to spread and consolidate US hegemonism world wide.
The latter project would mainly translate into US military interventions abroad of the Venezuelan type and a persistence if not a resurgence of identity based conflicts globally. Violent reactions internationally to what are seen as attempts by the US to bring recalcitrant sections in particularly the South under white supremacist control will provide the basis for the steadfast presence and spiking of identity politics globally.
Moreover, the path has been paved for stepped-up ethnic, religious and cultural disharmony within the US. A united state is far from possible, given this backdrop. Put simply, it would be a question of steeper political polarization at home and abroad.
The persistent, widespread support for the hard line Islamic regime in Iran locally and globally should serve as an eye-opener for the political decision-makers of the US. Huge crowds at the funerals of Iran’s political leaders could very well be state-orchestrated but they are a pointer to the fact that political Islam is far from on the decline. To the extent to which this is so, the phenomenon could be a hurdle in the path of a stridently expansionist US.
Looking back, it was the consolidation of the Islamic regime in Iran in the late seventies of the last century that, besides proving a major challenge to the unfettered global power expansion of the US and its Western allies, provided the motive force as it were for the proliferation of Islam-based identity politics in particularly the South. This continues to be so.
Going forward, the US would need to figure out how best it could manage the persistent presence of Islamic fundamentalism world wide, and for that matter other forms of identity politics, without drastically losing its global power and influence.
The recent successful challenge by Iran to the US’ efforts to exercise its diktat in West Asia should prove an ‘eye-opener’. In these confrontations both sides were bloodied but Iran proved that it could successfully take on the US militarily. The inference for the US ought to be that projecting its military might in the Middle East in a no-holds-barred fashion would not prove easy.
Arising from the foregoing a foremost policy challenge for the US would be to curb Iranian military power while avoiding another major military confrontation with the Islamic state that would cost the US and the world dearly in particularly economic and material terms. The US would have no choice but to persist with the often flagging West Asian peace effort and to render it fully workable.
Ukraine presents the US with another formidable challenge. As is known, Ukraine is proving no easy ‘push-over’ for Russia, but it is badly in need of more sophisticated Western arms, particularly effective air defense systems, to fully neutralize the Russian invasion. What would the US choose to do; go to Ukraine’s assistance fully or opt not to ruffle and antagonize the Putin regime, with which it is on some cordial terms?
A negotiated solution is best in Ukraine and the Trump administration would do well not to lose sight of this ideal but Russia too should see the need for a diplomatic solution if it is to salvage itself from its military stalemate in Ukraine. The US needs to try being a peace mediator in the latter theatre but if the Russian political leadership fails to opt for peace the US would have no choice but to join the rest of NATO and Europe in continuing to arm Ukraine.
The US would need to take the latter course if the ‘world’s mightiest democracy’ is to remain committed to its founding ideals. If President Trump fails to meet this challenge he would prove that he is nothing more than an ‘empty rhetorician’.
However, it should not come as a surprise to the world if Trump chooses not to strongly back the rest of the West on Ukraine. Domestic and foreign policy are closely intertwined. Since the Trump administration is committed to building a white supremacist state at home, democratic development worldwide has been of the least importance to it.
The Trump administration’s strong affinities to white jingoism would increasingly compel it to opt for a policy of international isolationism. As a result Ukraine could prove unimportant for the US going forward.
Consequently, US-Western Europe friction in particular is only likely to intensify in the days ahead. Coupled with the contentious issues growing out of the persistence of identity politics, the Trump administration’s far-sightedness in managing foreign policy issues would be tested to the fullest. Whether the world would have comparative peace or continued blood-letting would depend crucially on such judiciousness.
Features
Beyond concrete: Sunela Jayewardene urges Sri Lanka to rediscover an ancient wisdom for a planet in peril
It was more than a lecture on architecture. It was a challenge to rethink civilisation itself.
Standing before a packed audience at Dilmah by Genesis in Maligawatte, internationally acclaimed environmental architect, author and conservationist Sunela Jayewardene delivered a keynote that transcended blueprints, buildings and urban planning.
Instead, she invited her listeners on an intellectual journey into Sri Lanka’s ancient past, arguing that the answers to some of the world’s gravest environmental crises may already exist within the island’s forgotten ecological wisdom.
Her address, titled “Beyond Concrete: Architecture for the Coexistence of Species,” was at once philosophical, historical and deeply practical. It questioned humanity’s obsession with dominating nature and called for a return to a design ethic rooted in respect, restraint and coexistence.
“The road is actually very simple,” Jayewardene said. “We have simply forgotten it.”
That observation became the defining thread of an afternoon that challenged conventional thinking about architecture and development.
According to Jayewardene, modern society has inherited a worldview shaped largely by colonial values that placed human needs above those of every other living organism.
“Our value system was turned on its head,” she observed. “We accepted a Western way of looking at nature without questioning it. Today we can clearly see the consequences. The world is in crisis. Species are in crisis. Our lifestyles are in crisis.”
She was careful not to romanticise the past, nor was she dismissive of modern science. Instead, she argued that Sri Lanka’s pre-colonial civilisation possessed a sophisticated environmental philosophy that modern planners and architects have largely ignored.
For Jayewardene, environmental architecture is not about fashionable sustainability slogans or cosmetic landscaping.
It begins with humility.
It begins by recognising that humans are only one species among millions sharing the same landscape.
“The built environment should not exist in opposition to nature,” she said. “It should become part of nature.”
One of the most captivating moments of her presentation came when she introduced her own research into the island’s ancient sacred geography.
Using digital mapping and satellite imagery, Jayewardene demonstrated the remarkable alignment of Sri Lanka’s four original Saman Devalayas, whose axes converge on Sri Pada, historically known as Samanthakuta.
The extraordinary precision of these alignments, she argued, raises profound questions about the scientific and surveying capabilities of ancient Sri Lankan civilisation.
“What kind of technology enabled them to achieve this?” she asked the audience.
Her purpose was not to offer speculative answers but to challenge deeply ingrained assumptions that ancient societies lacked scientific sophistication.
“We often underestimate what our ancestors knew,” she said. “Yet the evidence around us tells a very different story.”
That forgotten knowledge, she argued, extended well beyond engineering.
It shaped an entire philosophy of living with the landscape rather than imposing human will upon it.
Displaying photographs from archaeological sites including Ritigala, ancient monasteries and rock pavilions hidden within Sri Lanka’s forests, Jayewardene illustrated how builders carved steps around natural boulders, integrated structures into existing rock formations and preserved the contours of the land.
Modern construction, she suggested, would almost certainly have bulldozed those landscapes into submission.
“Our ancestors honoured the land,” she said. “They accepted the landscape instead of trying to conquer it.”
For Jayewardene, that principle remains the foundation of every project she undertakes.
She described environmental architecture as an exercise in listening rather than commanding.
Every site, she explained, possesses its own identity, ecological history and natural rhythm.
The responsibility of the architect is to understand that identity before attempting to intervene.
“The land tells you what it wants to become,” she said.
Throughout the presentation, one word repeatedly surfaced—context.
Without understanding context, she argued, architecture becomes little more than sculpture.
Good design cannot be copied indiscriminately from one country to another or even from one district to another.
Climate differs.
Rainfall differs.
Vegetation differs.
Wildlife differs.
Culture differs.
Even the stories associated with landscapes differ.
All of these, Jayewardene insisted, must shape architecture.
“When I speak about inhabitants, I don’t mean only human beings,” she explained.
“The birds, insects, reptiles, mammals, trees and every living organism already occupying that land must become part of the design equation.”
This broader understanding forms the basis of what she describes as non-human-centred design—an approach that rejects the notion that cities exist exclusively for people.
Instead, landscapes should provide refuge for biodiversity while simultaneously serving human communities.
It is an idea that resonates strongly at a time when rapid urbanisation continues to erode habitats across Sri Lanka.
Jayewardene also challenged prevailing attitudes towards development itself.
Too often, she argued, “development” has become synonymous with replacing natural systems by concrete infrastructure.
She questioned whether flattening hillsides, redirecting streams and clearing vegetation can genuinely be described as progress.
In her view, genuine development should first ask what ecological value already exists before deciding what should be built.
One of the simplest yet most profound examples she offered concerned water.
“I always say it is acceptable to interrupt water,” she remarked. “But never disrupt it.”
That distinction reflects an ecological understanding often absent from conventional engineering.
Natural drainage systems, she warned, perform countless functions that remain invisible until they are damaged.
Floods, soil erosion, biodiversity decline and even changes in local climate frequently follow.
“We disrupt far more than water,” she said. “We disrupt entire ecological relationships.”
Equally significant was her distinction between degraded brownfield sites and relatively untouched greenfield landscapes.
Brownfield sites require ecological restoration, rehabilitation and renewal.
Greenfield sites demand restraint.
Minimal intervention, she argued, is often the highest form of environmental design.
The keynote found an appropriate setting within Dilmah Conservation’s own efforts to restore degraded urban landscapes.
Earlier in the programme, Rishan Sampath of Dilmah Conservation outlined the organisation’s transformation of an abandoned industrial property in Moratuwa into a flourishing urban forest containing over 300 tree species and more than 1,000 individual plants.
Scientific studies conducted within the restored forest have already demonstrated improvements in air quality compared with adjoining urban roads, providing measurable evidence that biodiversity restoration can improve city life.
For Jayewardene, such initiatives represent far more than beautification projects.
They demonstrate that ecological restoration can become a guiding philosophy for future urban planning.
Her address ultimately became a call to rethink humanity’s place within nature.
Architecture, she argued, should no longer celebrate domination over landscapes.
It should celebrate coexistence.
Every building should strengthen biodiversity.
Every development should restore ecological balance.
Every designer should ask not merely how a project serves people, but how it serves life itself.
As the audience left the hall, they carried with them more than architectural ideas.
They carried a challenge
To question inherited assumptions.
To rediscover indigenous ecological wisdom.
And to recognise that Sri Lanka’s greatest contribution to global sustainability may not lie in importing new environmental models, but in rediscovering the timeless principles embedded within its own civilisation.
For Sunela Jayewardene, the future will not be secured by building more impressive skylines.
It will be secured when humanity learns once again to build gently, intelligently and respectfully—allowing architecture to become not an act of conquest, but an expression of coexistence.
By Ifham Nizam
Features
Colombia’s “back-to-back queen”
Beyond modelling, Colombia’s Katherine Castaño, who captured the crown at the Top Model of the World 2026, in Egypt, is also a TV host, entrepreneur and social media influencer.
She’s based in Miami, Florida right now — a hub for fashion and influencer work — a city she calls home base, while representing Colombia on the world stage.
Her Miami base gives her access to fashion, entertainment, and business networks, while her title keeps Colombia front and centre in the global modelling conversation.
Off the runway, she says she enjoys singing, playing the piano, and tennis.
Katherine didn’t make the trip to Egypt as a newcomer. She’s built a strong international portfolio before winning the crown.
In fact, her résumé reads like a fashion passport: Colombia Moda, New York Fashion Week, Miami Swim Week, Miami Fashion Week, Nicaragua Diseña, IXEL Moda, and Mercedes-Benz San José.
On June 8, 2026, Katherine Castaño was crowned by outgoing winner Natalia Garizabal Vera, also of Colombia. That gave Colombia a historic back-to-back victory — the first time any country has done it in the competition’s history, and Colombia’s 4th win overall.
As Top Model of the World 2026, Katherine’s reign is centred on elevating her profile as a model, influencer, and entrepreneur.

She’s built a personal brand around beauty, ambition, style, and professionalism, with strong reach across fashion, social media, and business.
As titleholder, she’s now the face of the pageant’s international fashion platform, representing Colombia globally, while based out of Miami.
Ahead of the competition she was clear about the stakes: “This is bigger than me. This is for my country. This is for the story I’m here to write… And I’m not going quietly… we’re going for that back to back.”
As the reigning titleholder, Katherine Castaño’s role extends far beyond the sash. She’s using the platform to grow her brand as a model, influencer, and entrepreneur rooted in “beauty, ambition, style, and professionalism”.
She will also be doing runway shows, photoshoots, brand appearances, and fashion events.
Sri Lanka’s representative at this pageant was NetalieWithanage.
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