Engines Idling In New York Despite Law

(CNN) -- Passing laws is one thing; enforcing them is another.

Enter New York City's idling rule, meant to improve the city's air quality by prohibiting drivers from running their engines when they're not moving.

Toxic tailpipe fumes have been shown to increase rates of asthma and put children at risk of developmental delays, environmental studies show.

When cars and buses line up outside of schools, all those idling engines can worsen the quality of air both inside and outside the school, as children and parents come and go.

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