Researchers at the University of Toronto analyzed CT scans of 11,000 Canadians, matching home addresses to ten‑year pollutant records from Ontario’s monitoring network. Even though average exposure fell below local air‑quality standards, the study linked higher levels of PM2.5 and nitrogen dioxide to measurable coronary artery disease. Findings appear in Radiology and challenge the notion of a safe pollution threshold.

The team quantified risk: a 15% rise in long‑term PM2.5 exposure corresponded with an 11% increase in coronary calcium, 13% more plaque and a 23% jump in obstructive disease, effects that were stronger in women. Sonya Babu‑Narayan of the British Heart Foundation said the results underscore that even modest urban pollution carries meaningful cardiovascular risk for investors and policymakers today.

With the World Health Organization attributing 4.2 million annual deaths to outdoor pollution, the study adds pressure on regulators to tighten limits. Industries tied to vehicle exhaust, industrial emissions and wildfire smoke may face stricter standards, while insurers could reassess underwriting for cardiovascular claims. The research reinforces that cleaner air delivers both health and climate dividends for global stakeholders now as.