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Health implications of low-quality coal combustion: Evidence and emerging concerns at Sri Lanka’s Norochcholai Power Plant

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A representational image

Coal-fired power generation remains a central component of Sri Lanka’s energy mix, with the Lakvijaya (Norochcholai) Power Plant contributing a substantial share of national electricity production. Recent concerns regarding the importation and use of low-quality coal have raised critical questions about environmental emissions and associated public health risks. This article synthesizes global epidemiological evidence on coal-related pollution and evaluates its relevance to the Sri Lankan context, with particular emphasis on exposure pathways, health outcomes, and policy implications.

Coal combustion is a major contributor to ambient air pollution worldwide. The health burden associated with coal-fired power plants is well documented, particularly in regions where low-grade coal is used and emission control technologies are inadequate. In Sri Lanka, recent reports of substandard coal imports to the Lakvijaya facility necessitate a rigorous assessment of potential health impacts on surrounding communities. Importantly, reductions in coal quality do not result in proportional increases in emissions; rather, even modest declines in fuel quality can lead to disproportionately higher pollutant emissions and, consequently, greater health risks.

Low-quality coal is typically characterised by high ash content, elevated sulfur concentrations, the presence of trace heavy metals (such as mercury, arsenic, and lead), and a lower calorific value. Combustion of such coal results in increased emissions per unit of electricity generated. Key pollutants include fine particulate matter (PM₂.₅ and PM₁₀), which can penetrate deep into the respiratory tract; sulfur dioxide (SO₂), a precursor to secondary particulate formation; nitrogen oxides (NOₓ), which contribute to ground-level ozone and respiratory irritation; heavy metals with neurotoxic and carcinogenic properties; and fly ash, a complex mixture of mineral residues and toxic elements.

Populations residing near coal-fired power plants may be exposed to these pollutants through multiple pathways:

=Inhalation:

 Direct exposure to airborne particulates and gaseous pollutants

=Ingestion:

 Consumption of contaminated water or food, particularly through bioaccumulation of mercury in fish

=Dermal contact:

 Interaction with contaminated soil or fly ash

=Marine exposure:

 In coastal regions, bioaccumulation of toxic substances in seafood represents an additional and significant risk

A substantial body of scientific literature links coal-related air pollution to a wide range of adverse health outcomes. Exposure to particulate matter and sulfur dioxide has been associated with increased incidence of asthma, exacerbation of chronic obstructive pulmonary disease (COPD), chronic bronchitis, and reduced lung function. Fine particulate matter is also implicated in cardiovascular morbidity, including increased risk of myocardial infarction, stroke, hypertension, and systemic inflammation. Exposure to mercury and lead is linked to neurodevelopmental deficits and reduced cognitive function in children. Additionally, coal combustion releases carcinogenic substances such as arsenic and polycyclic aromatic hydrocarbons, thereby increasing long-term cancer risk, particularly lung cancer.

International evidence underscores the magnitude of these risks and the effectiveness of mitigation strategies. In the United States, a large-scale cohort analysis (1999–2020) estimated approximately 460,000 premature deaths attributable to emissions from coal-fired power plants; mortality declined significantly following the implementation of flue-gas desulfurisation systems, demonstrating the effectiveness of emission controls. In India, reliance on low-grade, high-ash coal has been associated with a substantial disease burden, including an estimated 720,000 premature deaths over a decade, exacerbated by weak enforcement of emission standards. In China, policy-driven closure of small, inefficient coal plants between 2006 and 2010 resulted in marked improvements in air quality and the prevention of approximately 46,000 child deaths, providing strong evidence of the reversibility of health impacts through regulatory intervention.

The Lakvijaya Power Plant has recently come under heightened scrutiny regarding coal quality and ash management practices. Key concerns include increased ash generation associated with substandard coal, potential elevation in mercury emissions, and reports of environmental contamination in surrounding areas.

Analysis of recent coal shipments to Norochcholai indicates an ash content exceeding 21% on an air-received basis—nearly double the Lanka Coal Company’s specified standard of 11%. For a typical shipment of approximately 60,000 metric tons, coal with 21% ash content would generate around 12,600 metric tons of ash, compared to approximately 6,600 metric tons from coal meeting the 11% standard. This represents an excess of over 6,000 metric tons of industrial waste from a single shipment. Furthermore, emission data from selected dates in February 2026 indicate elevated levels of carbon monoxide, nitrogen oxides, particulate matter, and sulfur dioxide during periods when these coal shipments were utilised.

Data from the Public Utilities Commission of Sri Lanka (PUCSL) further indicate a substantial increase in fly ash discharge. Average fly ash emissions rose to approximately 0.093 kg/kWh when using coal from the current supplier, compared to approximately 0.046 kg/kWh under the previous supplier—an increase of about 102%. Although comprehensive epidemiological studies specific to Sri Lanka remain limited, these findings closely mirror conditions observed in high-burden regions globally.

The dispersion distance of pollutants may vary according to local environmental conditions, including wind velocity and direction, ash characteristics, and precipitation patterns. Recent reports indicate the occurrence of unusually dark cloud formations in parts of the North Western, Western, Central, and North Central Provinces over the past several weeks. In parallel, clinicians have observed a notable increase in exacerbations of asthma, COPD, and allergic respiratory conditions in these same regions over the past few months.

Given the relatively short distance between the Norochcholai coal power plant and major population centers—approximately 140 km to both Colombo and Kandy—the potential for the transport of toxic pollutants through atmospheric dispersion and rainfall cannot be overlooked. These observations warrant systematic scientific investigation to assess possible environmental exposure and to determine any causal links with the reported health outcomes.

The continued use of low-quality coal in power generation presents a clear and preventable public health risk. Global evidence demonstrates that such risks can be significantly mitigated through stricter fuel quality standards, effective emission control technologies, and robust regulatory enforcement. For Sri Lanka, the situation at the Lakvijaya Power Plant represents a critical opportunity to integrate public health considerations into national energy policy. Failure to address these concerns risks not only long-term health and economic consequences but also a significant erosion of public trust in governance, particularly in the context of commitments to transparency and accountability.

by Dr. Channa Jayasumana
MBBS, PhD, FRCP Edin
channajayasumana@gmail.com



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Features

‘Lord Edgware Dies’

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It has been some time since I read an Agatha Christie, the plot of which I cannot remember. So, I was delighted to find on the shelves of a friend Lord Edgware Dies, which I had a vague memory of, but no certainty about who had done it.

When I read it, I found that my memory of who was probably the killer was correct, but I could not be certain and the red herrings Christie threw in were so diverting that until almost the very end I wondered if I had been wrong.

The plot is very simple. Jane Wilkinson, who is married to Lord Edgware, tells him that she is desperate for a divorce since she is in love with a very proper Anglo-Catholic peer, Lord Melton, but Edgware refuses to divorce her. She asks Poirot to talk to him, which he does, and is surprised to find that Edgware has told Jane he is prepared to give her a divorce. This was, after he had categorically refused, through a letter, which Jane said she had not received.

That night Edgware is murdered, after Jane had been to see him, or so the butler said, and also Edgware’s secretary. But Jane had been that evening at a grand dinner many miles away, where a dozen fellow guests could swear to her presence.

There was a solution however to the mystery of two Jane Wilkinsons, namely a skilful impersonator called Carlotta Adams who, in the opening chapter had impersonated Jane Wilkinson, who had also been at the performance. But when Poirot goes to see her, he finds that she had been found dead on the morning after Edgware had been killed, of an overdose. And in her bag was a gold case, with a strange inscription, that contained the drug, along with a pair of pince-nez.

Her maid said she had written a letter to her sister in America and posted it the previous night. Poirot asks Inspector Japp to get the letter, and a transcript is received from America, and in it the name of Edgware’s nephew Ronald Marsh is mentioned; he had taken Carlotta to dinner after her performance, with which the book opens, and had then set her a challenge. Japp arrests Marsh, but Poirot is not happy and asks for the original of the letter, which the sister sends him. That shows that a page is missing, and the tear is obvious, though that raises the question as to why it had not simply been cut.

Matters are further complicated by the fact that Marsh had gone in a taxi to the Edgware house, along with Edgware’s daughter Geraldine, in the interval of an opera which had previously seemed to provide them with cast iron alibis. Geraldine had gone in to fetch her pearls so that Marsh could raise money he needed, and thus had an opportunity to kill Edgware, as did Marsh, for the driver said he had got out of the taxi while waiting and gone into the house.

Agatha Christie

Marsh explained why he had gone to the house on the night of the murder as having followed Bryan Martin, an American actor, who had been in love with Jane, whom he saw go into the house with a key. But there was no one visible when he entered, and Geraldine almost immediately came down and they left together. And Martin too has become an object of suspicion to Poirot, for he had been to see him before the murders were discovered with a story of being followed by a man with a gold tooth – a story Poirot immediately realized was false when he was asked how old the man was, and was told he was young, for young people did not have gold teeth.

A heap of French money Edgware had got for a trip to Paris was missing, but since Marsh had no need for it after his cousin’s offer of help, Poirot deduces that it must have been taken by the butler, who has disappeared. Christie has stressed that he is astonishingly handsome, unusual in a butler, and Poirot notes a resemblance to Martin, so he thinks the mysterious man going into the house must have been him.

Incidentally, later Poirot assumes that Edgware’s change of mind was because he was involved in some scandal, and I believe Christie intends us to see the cause of this in his handsome butler, though this is not specified.

Meanwhile, Poirot has asked Japp to find out the provenance of the case found in Carlotta’s handbag, and it turns out to have been made in Paris, specially commissioned, and collected by a woman with pince-nez.

But then another murder occurs—that of another guest at the grand dinner, which provided Jane with her alibi. The victim is an actor who had been bemused when Jane, at a lunch, thought the Judgment of Paris referred to the city. He told Hastings he wanted to see Poirot, but was killed before he could get to the appointment. Poirot had rushed there when told about his request, but it was too late.

Meanwhile, Poirot has tried out the pince-nez on Edgware’s secretary, but she could not see through these. It was only a chance remark heard outside the theatre that led him to try them out on Wilkinson’s maid Ellis, a spare pair that had been appropriated for the night of the murders.

Poirot then lays things out, having summoned Martin and told him that he probably suppressed Edgware’s letter, as he had been dropped by then and he did not want Jane to marry another. But after teasing Martin, Poirot says that Jane was in fact the murderer, and she got Carlotta to impersonate her at the dinner while she went to the house and killed her husband. After meeting Carlotta later and checking with her through a call that she had not been rumbled, Jane had gone ahead with the murder – she put veronal into her drink and the case with veronal into the handbag. She forgot to take out the pince-nez she had used earlier to imitate an American. Carlotta had registered as the American in a hotel and Jane had gone to see her, and there they exchanged identities. After seen the letter, she made use of it by tearing off the page that referred to her, and the S of She, so that the person who had challenged Carlotta to impersonate her seemed to be a man.

There is a coda in which Jane, condemned to death, writes to Hastings, still full of pride at her ingenuity hoping she will be remembered.

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Desilt reservoirs, learn from our ancient irrigation systems

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Polgolla

by Prof. O. A. Ileperuma

Silting of reservoirs is a major problem today affecting our hydropower production and irrigation systems. The main Mahaweli reservoirs are silted to a considerable extent reducing the water holding capacity of them. Due to poor soil management practices, floodwaters deposit large amounts of silt in these reservoirs. When the Polgolla reservoir was fully drained about two years back, one could see mountains of silt in the lower reaches of the reservoir. A rough estimate is that 50% of the total capacity of these reservoirs has been lost to siltation. This is a serious issue which affects not only power and agriculture but also flood control.

Our ancient irrigation systems ensured that desilting of reservoirs took place under royal decree where all users of the reservoirs were ordered to carry out desilting of reservoirs during the dry season. The clay thus collected was used in making bricks for the construction of great stupas which dot the landscape of our ancient kingdoms. This ensured that the reservoirs had their full capacity filled with water for the next cultivating season. Our ancient kings were clever enough not to construct reservoirs by blocking main rivers such as the Mahaweli. A classic example is the Minipe left canal where they tapped only the surface water of Mahaweli. Even the bigger tanks such as Nuwara Wewa and Parakrama Samudraya were fed with minor rivulets. There were also other ingenious features in the cascade irrigation systems built by the ancient kings, such as mud sluice canals and forest reservations between the reservoirs in the cascade system. These reservations helped trap silt and remove excess nutrients, which could otherwise contribute to increasing salinity as water flowed from one reservoir to another.

Victoria

Moragahakanda

A classic engineering marvel is the former Yoda Ela, which carries water from Kalawewa to Nuwara Wewa and Tissa Wewa. It is 87 km long although the straight distance between these points is only about 40 km. The gradient of this canal is about 10 cm per km or 6 inches per mile. Yodha Ela functions as a moving reservoir and feeds about 4,600 hectares of paddy lands. It is a winding canal with about 120 smaller reservoirs on its way. It was constructed during the reign of King Dhatusena around 459 AD and later expanded by King Parakramabahu by connecting more reservoirs to the network. Unfortunately, during the Mahaweli project our modern-day engineers constructed a concrete canal replacing the winding path of this Yoda Ela also called Jaya Ganga. This effectively removed the ability of the old Yoda Ela to remove silt and nutrients. The bank of this Ela has wet zone trees such as jak and areca nut growing well. They take up the nutrients from the flowing stream making the water suitable for irrigation later.

Ancient Mesopotamian civilisations depended on dams constructed along the two main rivers, Euphrates and Tigris. After continuous irrigation of their fields over several thousand years, salinity of the irrigated lands increased making them unsuitable for agriculture. People died due to famine and this clearly illustrates the danger of blocking main rivers for agriculture. There is scientific evidence that the salinity of paddy soils in the Mahaweli C area is increasing.

We saw the devastation caused by Cyclone Ditwah. The sluice gates of the Kotmale Reservoir were opened, and Kandy and Peradeniya were flooded. If the reservoir had had greater storage capacity, couldn’t the opening of the gates have been delayed? This may not be an argument that modern-day engineers would readily accept, and I am not an irrigation expert. These ideas may well be naïve. But most of us tend to think of reservoirs mainly in terms of hydropower generation and irrigation, while their role in flood control receives much less attention. The question therefore deserves serious consideration. Could restoring lost reservoir capacity through desilting help improve our ability to manage extreme rainfall and reduce flood risks?

Desilting our reservoirs should be considered a national priority.

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Losing out to Ethiopia

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From Trailblazer to Tailender

Export diversification – Missing the wood for the trees – Part III

by Gomi Senadhira

In Sri Lanka, the word “Ethiopia” is often used as disparaging slang to describe individuals or areas experiencing extreme poverty, starvation, or severe economic hardship. This linguistic habit originated in the 1980s with the Western media coverage of the devastating Ethiopian famine of 1983-85. That media coverage shocked the world but also left an outdated and offensive global stereotype that the country is permanently starving. Much has changed since then. By now, with an annual growth rate of around 9%, it is the fastest-growing economy in sub-Saharan Africa. Ethiopia has also emerged as a highly competitive exporter and is challenging not only its competitors in the region but also countries like Sri Lanka. This article is on how Sri Lanka has lost ground to Ethiopia (and a few other countries) in the GCC markets for agricultural and floricultural products.

Sri Lanka – A Pioneer in the Agriculture and Floricultural Market in the GCC

As discussed in Part II of this article, by the mid-1980s Sri Lanka had established a strong foothold in the GCC’s fruit, vegetable, and floricultural market. Geographical proximity and well-established shipping and air links gave Sri Lanka a strong comparative advantage over Southeast Asian and African nations. Thailand, Vietnam, and Kenya were not even in the market. At that time, Ethiopia was experiencing (as BBC news reports described) “a biblical famine”.

The market was not very large, but it was lucrative and growing. Trade Minister Lalith Athulathmudali as well as the Chairman of the Export Development Board, Victor Santiapillai, who visited Kuwait (and the GCC countries), recognised the market potential for these products and encouraged us to continue with our work. The minister was particularly keen to further develop links between the market for these products, exporters, and his Export Production Villages (EPVs). So, it was becoming a successful case not only for export diversification but also for transferring gains from exports directly to rural households.

From Trailblazer to Tailender

As a result, even by the beginning of this century Sri Lanka had a larger market share than most of its competitors from Asia or Africa. But since then, our competitiveness has weakened significantly. The tables below provide a comparative snapshot of Sri Lanka’s performance vis-à-vis Thailand, Vietnam, Kenya and Ethiopia in the GCC market for vegetables, fruits and floricultural products. As illustrated therein, in 2001 Sri Lanka was ahead of Thailand, Kenya and Ethiopia in this small but rapidly growing market. Since then, we have fallen behind Thailand, Kenya and many other countries in that lucrative market. If this trend continues, Sri Lanka will fall behind Ethiopia within the next few years. (See Table 1)

In the GCC market for vegetables (covered in HS chapter 07), Sri Lanka was ahead of most other competitors in 2001. As illustrated in Table 1 , Sri Lanka had failed to develop this market, while Thailand, Kenya, and even Ethiopia had very efficiently increased their market shares. The GCC is a market to which Sri Lanka can supply some vegetables, like cabbages, by sea. It appears Sri Lanka had also failed to exploit this mode of supply.

We can see a similar trend in the market for fruits. Vietnam, Kenya, and Thailand have emerged as major players, while exports from Sri Lanka have staggered on slowly. In this segment, Vietnam has emerged as a leading player during the last twenty years and the GCC imports from Viet Nam have shot up from US$44 thousand in 2001 to US$346 million by 2024. In part one of these articles, I discussed the remarkable increase of jackfruit exports from Vietnam “…just $3 million in 2015 to an impressive $236.8 million in 2023” while most of our jackfruit production rots under the trees. This explains how countries develop their markets, geographically and product-wise. (See Table 2)

Sri Lanka’s performance has been weakest in the market for floricultural products (HS Chapter 06), which groups live trees, cut flowers, and ornamental foliage. When we first entered the market in the 1980s, the market was dominated by the Netherlands, and Kenya and Ethiopia were not even in the market. At that time, we identified the Gulf states as a market where Sri Lanka could have a dominant presence due to geographical proximity. Even in 2001, Sri Lanka was ahead of Kenya, Ethiopia, and Thailand. But by now, Kenya has emerged as the dominant supplier. Ethiopia is also expanding its market share and is the third-largest exporter. (See Table 3)

Missing the Wood for the Trees

In the mid-1980s, Sri Lanka first established its foothold in the GCC market. Since then, Thailand, Vietnam, Kenya, and even Ethiopia have moved well ahead of us and have become leading players. Why did we lag behind in our export diversification efforts in general and, more particularly, in the GCC market?

The reasons are very clear. After the initial attempts in the 1980s and early 1990s, Sri Lanka has not been proactively involved in identifying, developing, and promoting new products and markets, or protecting and further developing new markets already established. The focus has simply been on traditional exports: tea, coconut, cinnamon, and garments, while other products were almost ignored. In essence, we have been and continue to focus intensely on a narrow group of products and markets, and we have lost sight of the bigger picture.

(The writer can be reached at senadhiragomi@gmail.com)

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