Idle Moments Turn into Tons of Air Pollutants at Schools

Idling school buses spew tons of exhaust into the air, putting children at risk when they leave school at the end of each day. In New York City alone, idling vehicles emit as much pollution as nine million diesel trucks driving from the Bronx to Staten Island. But the city's laws requiring them to shut down their engines in school zones are poorly enforced.















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FUMING: School buses idling as they pick up children emit significant amounts of pollutants. Image: iStock/LaserLens

At 2:33 p.m. in New York City’s East Harlem, four short yellow school buses pull to a stop in front of Reece School, a private elementary school for special needs children. The bus drivers pop their doors open and idle, engines running, while they await their young passengers.

As the students trickle out of the school, a clipboard-wielding teacher checks their names off her list and guides them to their buses. On the older buses, the engines rumble as the children climb aboard. At 2:40 p.m., the first bus is full and off it goes, down the hill, merging with traffic on Madison Avenue.

The second bus inches forward and stops. Six more round the corner onto 104th Street, all with engines running.

By 2:45 p.m., all the students are heading home.

Between dismissal and departure, the diesel engines idled for 12 minutes, spewing exhaust into the air in front of the school.

Idling longer than one minute in a school zone is illegal in New York City for all vehicles, but the laws are rarely enforced. Before dismissal, around the corner on Madison Avenue, a produce delivery truck idled for several minutes, double-parked—all while a traffic enforcement cop stood two cars down.

Idling buses, cars and trucks may not seem like a big deal, but in New York City they spew out as much pollution as nine million diesel trucks driving from the Bronx to Staten Island, according to the Environmental Defense Fund. That’s roughly 130,000 tons of carbon dioxide, 940 tons of nitrogen oxide, 24 tons of soot particles, and 6,400 tons of carbon monoxide each year.

Vehicles running on diesel fuel release fine particulate matter and elemental carbon—also known as black carbon. In studies around the world, particulates have been linked to deaths from respiratory disease and heart attacks. Diesel exhaust also contains several carcinogens and other toxic substances.

For school children, health experts say diesel exhaust presents a serious health concern—especially to asthmatics—because it can trigger asthma attacks.

In New York City, the asthma hospitalization rate is almost twice the national average, and neighborhoods in Northern Manhattan, including East Harlem, have among the highest rates of pediatric asthma hospitalization and mortality in the city. Asthma is the most common cause of hospitalization for children under 14 years old, and in New York City’s worst neighborhoods, an estimated 1 in 4 school children have asthma, according to the Asthma Free School Zone, a New York based non-profit group.

In May, scientists in New York reported that school zones’ concentrations of black carbon—a predictor of diesel pollution—are related to idling of buses and trucks at the end of the school day.

“If you find ways to either curb bus emissions or curtail bus idling, and cut traffic in general, children’s exposure to black carbon should be reduced,” said Jennifer Richmond-Bryant, lead author of the study. She was an assistant professor at Hunter College in New York at the time of the study, but is now with the U.S. Environmental Protection Agency. The Asthma Free School Zone was also involved with the study.



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  1. 1. shortyblackwell 03:53 PM 10/30/09

    It seems school busses can do whatever they want. They block traffic out of school driveways in the town where I live (Marlboro,NJ), hold up traffic on major highways to talk to the parents of kids boarding the bus, go food shopping with the bus. But this is all ok. After all, its "for the children". Barf.

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  2. 2. Jbfreem 05:07 PM 10/30/09

    To help enforce the law, post signs announcing an idle-free zone. Supervised children can help enforce the law by handing out "tickets" to drivers. For more info see http://www.idle-free.info/

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  3. 3. VM-T 07:44 AM 10/31/09

    What a great article. EPA and NYC DEP should also be givent he authority to enforce this regulation, and allow their inspectors to be able to ticket school bus drivers, as well as penalize the private bus companies that repeatedly break the anti-idling law. Nothing curbs behavior like aggressive enforcement and stiff financial penalities, works like a charm. The City of New York and the feds should begin a joint enforcement effort, children's health and the quality of the air we all breathe is at stake.

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  4. 4. InquiringConstructivist 01:07 PM 10/31/09

    It's no coincidence that the class of people not allowed to vote get the dirtiest, ugliest, cheapest buses. My students in NYC called these "cheese buses."
    Let's get them the best, safest, hybrid-electric buses out there. Some districts have started doing this.

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  5. 5. mtrancher 06:22 PM 11/3/09

    As a substitute school bus driver I noticed the article describes the buses slowly moving forward apparently loading one at a time; how can you shut the engine down every moment you pause in that line? I welcome the chance to turn off the engine but give me a place to park until I leave; you don't shut down while you are waiting in traffic!

    I also would like to leave behind those kids who are late to the stop, don't appear to hurry or aren't ready to get on or off at their stop but the complaints would be waiting for me at the bus barn. I would like to drive a bus for an orphanage instead!

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  6. 6. Green Engineer 11:45 AM 11/6/09

    These buses are the worst to be stuck behind, not just when they are stopping to deal with kids, but just the simple spew of pollution which comes out of them, must be one bus equals 100's of cars, like a gas chamber. Why can't they have pollution controls on them like other vehicles. DMV and EPA, get to work!

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