In a new study that was carried out in shantytowns near Lima, Peru have shown that teenagers who live next to busy roads are at a greater risk of developing allergies and asthma.

The findings show that the risk of developing allergies to dust mites, pet hair and moulds can go up by 30 percent, while the risk of asthma symptoms, such as wheezing, can double.

The study is thought to be the first to link heightened rates of allergic disease and exposure to traffic-related pollution as a possible reason for increased rates of asthma along major transit routes.

According to experts at Johns Hopkins, no study has until now looked at how busy roadways affect the allergic origins of asthma.

The study involved 725 teenagers, aged 13 to 15, who were living in Pampas de San Juan de Miraflores, Peru.

It found that the risk of having an allergic disease (atopy) and asthma was worst for those living immediately next to a busy road, where a steady stream of traffic across multiple lanes flowed unimpeded all day long.

Atopy rates went up by 7 percent for every city block (approximately 300 feet) closer they lived to the road. For those who lived next to the road, the odds of having asthma were twice that of those who lived a quarter-mile (about four city blocks) away.

"Our study clearly shows why we need to protect respiratory health and plan future major roadways here or abroad away from residential areas and schools," said senior study investigator William Checkley.

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