Julia Burrell and her two young children were enjoying a day at the park near their East Boston home when their noses started to burn.

Believing it to be a symptom of air pollution from Logan Airport, Burrell told her girls to cover their noses and run home.

Burrell and her husband knew noise would be an issue when they bought a house near the airport a decade ago. But they were unaware of a silent menace — ultrafine particles from jet engine exhaust — that they now say can put their children at risk, just by breathing.

“Air pollution was something we didn’t really sign up for,” she said.

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