Effect of traffic pollution on respiratory and allergic disease in adults: cross-sectional and longitudinal analyses.

One study that did report an adverse effect looked at US male veterans and showed that those living within 50 m of major roads had a increased risk of persistent wheeze, with a significant odds ratio of 1.7 for heavily trafficked roads (> = 10,000 vehicles a day), but a smaller effect (OR = 1.3) which reached borderline significance when all major roads were considered[ 1 ].

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Two other recent studies have shown increased risks of wheeze of borderline significance in relation to increased residential proximity to surfaced roads in Ethiopia[ 2 ] and living within 20 m of a main street in Switzerland[ 3 ].

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