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Saharan dust days worsen coarse-PM mortality

In Rome 2001–2004, coarse PM raised death risk most on Saharan dust days; fine PM effects were not modified by dust.

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How frequent were Saharan dust days in Rome 2001–2004?

18.6% of days (264 days), peaking in summer (26.1%).

How was a dust-affected day defined?

Dust index of 1 plus a ground-level PM10:NO2 ratio > 0.6.

Which PM fraction showed the strongest mortality associations?

Coarse particles (PM2.5–10).

What was the IQR PM2.5 effect on overall mortality?

A 12.8 μg/m³ rise linked to a 1.24% increase (CI included the null).

What range of coarse-PM mortality increases was reported?

2.96% for natural mortality to 12.65% for respiratory mortality per IQR.

Did Saharan dust modify fine-PM effects?

No; PM2.5 interaction p-values were always > 0.30.

How did coarse-PM cardiac effects differ on dust days?

9.73% on dust-affected days vs 0.86% on dust-free days (p = 0.005).

How did mean coarse PM change on dust days?

20.7 μg/m³ vs 14.6 μg/m³ on dust-free days.

What PM10:NO2 ratio distinguished dust vs traffic days?

≤0.6 is typical of traffic-dominated Italian cities; dust days averaged 0.9 ± 0.4.

How many nonaccidental deaths were analyzed?

80,423 deaths among residents ≥35 years.

What did authors conclude about air-quality standards?

Standards should consider health effects of dust from natural sources.

How was coarse PM constructed?

24-h PM2.5 subtracted from PM10 at the same NIH station.