🟠 Moderate Evidence
Ambient fine particulate matter (PM2.5) pollution caused 2.955 million deaths in BRICS nations (Brazil, Russia, India, China, and South Africa) in 2023, accounting for 59% of the global PM2.5-attributable mortality burden, according to the BMJ Global Health‘s Global Burden of Disease 2023 analysis. Despite decades of environmental policy, age-standardised mortality and disability-adjusted life year (DALY) rates in BRICS remain substantially higher than global averages and have increased since 1990, contrasting sharply with sustained declines observed in Group of Seven (G7) nations.
Key takeaways
- PM2.5 pollution caused 2.955 million deaths in BRICS in 2023—59% of the global burden—with rates rising since 1990 contrary to G7 trends
- India bears the heaviest and fastest-growing burden; China’s remains high but stabilised; Brazil and Russia achieved marked reductions
- Population ageing in China, population growth and deteriorating epidemiological conditions in India and South Africa are key drivers of the disease burden
- Ischaemic heart disease and chronic obstructive pulmonary disease are the leading PM2.5-attributable causes in BRICS, unlike Alzheimer’s disease in the G7
Study at a Glance
| Source | BMJ Global Health |
| Study type | Burden of disease analysis using Global Burden of Disease 2023 data |
| Geographic scope | BRICS nations (Brazil, Russia, India, China, South Africa) vs. G7 and global benchmarks |
| Time period | 1990–2023, with projections to 2050 |
| Methods | Joinpoint regression, age-period-cohort modelling, Das Gupta decomposition, Bayesian projections |
PM2.5 Disease Burden by BRICS Nation: Deaths and Trends
Age-standardised mortality trends and absolute disease burden, 1990–2023
Source: BMJ Global Health, Global Burden of Disease 2023 | Georgian Medical Journal News
India’s burden growing; China’s stabilising
The 2.955 million deaths in BRICS in 2023 mask substantial heterogeneity across the five nations. According to the BMJ Global Health analysis, India shoulders the heaviest burden and exhibits the most rapid growth trajectory, driven by concurrent population expansion and deteriorating epidemiological conditions under high PM2.5 exposure. China’s absolute mortality burden remains among the highest globally, but age-standardised rates have stabilised in recent years following aggressive air quality interventions implemented over the past decade. Brazil and Russia, by contrast, have achieved marked reductions in PM2.5-attributable mortality and DALYs since 1990, demonstrating that policy-driven air quality improvements can reverse disease burden trends even in middle-income settings.
Age-period-cohort (APC) modelling revealed pronounced mortality increases in older age groups, particularly among those aged 95 and over in both China and India. This pattern reflects both the genuine health impact of cumulative PM2.5 exposure over decades and the demographic shift toward older populations in rapidly ageing societies—a factor that will intensify PM2.5-attributable disease burden in the near term regardless of air quality improvements, according to the study’s decomposition analysis.
Disease spectrum differs markedly from wealthy nations
A striking finding is the divergence in disease patterns between BRICS and G7 nations. The BMJ Global Health study identified ischaemic heart disease, chronic obstructive pulmonary disease (COPD), and intracerebral haemorrhage as the leading PM2.5-attributable disease burdens in BRICS. In contrast, Alzheimer’s disease and other dementias rank first among PM2.5-attributable causes in the G7. This epidemiological divergence likely reflects differences in population age structure, baseline cardiovascular and respiratory health, and healthcare access, with BRICS populations experiencing higher rates of cardiovascular and respiratory disease across the lifespan.
The prominence of COPD and ischaemic heart disease in BRICS underscores the direct pathophysiological mechanisms by which inhaled PM2.5 particles penetrate the respiratory tract, triggering systemic inflammation, oxidative stress, and atherosclerotic progression. This suggests that reducing PM2.5 exposure in BRICS could yield substantial gains in preventable cardiovascular and respiratory morbidity—gains that may exceed those achievable in ageing G7 populations where neurodegenerative disease dominates the PM2.5-attributable burden. The finding aligns with epidemiological evidence from WHO air quality research linking long-term PM2.5 exposure to systemic cardiovascular and pulmonary pathology.
Population ageing and growth: dual drivers of future burden
Das Gupta decomposition analysis, employed to isolate the drivers of temporal changes in disease burden, identified population ageing as the dominant force in China, where demographic transition has accelerated over two decades. In India and South Africa, by contrast, population growth itself—combined with deteriorating epidemiological conditions (including rising prevalence of hypertension, diabetes, and smoking) under sustained high PM2.5 exposure—drives increases in absolute burden. The BMJ Global Health projections to 2050 indicate that BRICS burden will remain substantially above the global average even if current air quality trajectories continue, reflecting the structural inevitability of these demographic and epidemiological currents.
Notably, the study projects that even optimistic air quality improvements will be offset partly by ongoing population growth and ageing in the near term. This finding underscores a critical policy implication: BRICS nations cannot rely on air quality improvements alone to reduce PM2.5-attributable disease burden over the next two decades. Concurrent investments in cardiovascular and respiratory disease prevention, screening and treatment—alongside emission reduction efforts—will be essential to bend the disease burden curve. Visit Global Health coverage for related policy analysis.
In 2023, PM2.5 pollution caused 2.955 million deaths in BRICS, accounting for 59% of the global PM2.5-attributable mortality burden, with age-standardised rates rising since 1990 and substantially exceeding global averages.
— Global Burden of Disease 2023 Collaborative Network, BMJ Global Health (2024)
What this means
Frequently asked questions
How does PM2.5 pollution differ from other air pollutants?
Fine particulate matter (PM2.5) consists of particles smaller than 2.5 micrometres in diameter—small enough to penetrate deep into the lungs and enter the bloodstream. Unlike larger dust particles, PM2.5 bypasses upper airway defences and directly damages the alveolar epithelium and pulmonary vasculature, triggering chronic inflammation and systemic effects on the cardiovascular and nervous systems. According to the BMJ Global Health study, this is why ischaemic heart disease and COPD dominate the PM2.5-attributable disease spectrum in BRICS.
Why are disease patterns different in BRICS compared to G7 nations?
BRICS populations are younger on average and suffer higher baseline rates of cardiovascular and respiratory disease due to sustained high PM2.5 exposure over decades, greater smoking prevalence, and limited access to preventive healthcare. In contrast, G7 populations are much older, and age-related neurodegenerative diseases dominate their disease burden. Even when exposed to PM2.5, elderly populations’ primary health risks shift toward Alzheimer’s disease and dementias rather than acute cardiovascular events or COPD exacerbations.
Can air quality improvements alone reverse the BRICS PM2.5 disease burden by 2050?
No. The BMJ Global Health projections show that even sustained air quality improvements will be partially offset by population growth (especially in India and South Africa) and population ageing (especially in China). Concurrent investments in cardiovascular and respiratory disease prevention, early diagnosis, and treatment are essential to meaningfully reduce the disease burden trajectory over the next 25 years.
The BMJ Global Health study represents the first systematic, spatiotemporal assessment of PM2.5-attributable disease burden across BRICS to 2050. Its findings should catalyse urgent policy action within each nation and across BRICS frameworks to accelerate air quality regulation, strengthen cardiovascular and respiratory disease control programmes, and build health system capacity to manage the projected burden. For deeper analysis of global air quality trends, explore Data & Numbers coverage on environmental health.
Source: Impact of ambient fine particulate matter (PM2.5) pollution on disease burden in BRICS from 1990 to 2023: evidence from the Global Burden of Disease Study 2023, BMJ Global Health
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