um, and w when you gogo basicallly 0 blocksks south to o the upperr eastside, you find that t the asthmhma rate for children is le half of f that. >> we house over one third of the new york city's diesel bus fleleet. and d when you fige that we've got 5 depots, each with 200 or more buses, these are depots right across from people's homes, u uh, from schools, across from parks. >> researches at columbia university found that pregnant african american and dominican american mothers in new york city who are exposed to high levels of airborne pollutants from vehicle exhaust and burning solid waste gave birth to children who later developed cognitive and behavioral problems. dr. frederica perera led the study. >> > developmenental delay at ae 3, withth cognitive deficits at age 5, and behavioral problems, including anxiety, depression, and attention, symptoms of those problems, at ages 6 to 7. >> these children also scored more than 4 points lower on standardized intelligence tests at age 5. >> [i[indistinct chatter]r] >> even a verery small drdrop in i.q. cacan affect or can be predicted to a