. >> so thehe asthma rarate in whe call centntral and east harlemm is at one in 4 children. um, anand when yoyou go basiically 0 blblocks southth to the upupper eastside, you find ththat the asthma rate f for children is le halflf of that. >> we house over one third of the new york city's diesel bus fleet. and when youou figure that we've got 5 depots, each with 200 or more buses, these are depots right across from people's homemes, 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 burnrng solid waste gave birth to children who later developed cognitive and behavioral problems. dr. frederica perera led the study. >> develolopmental dedelay at ae 3, with cognitive deficitits at age 5, and behavioral problems, including anxietyty, depression, and attention, symptoms of those problblems, at ages 6 to 7. >> these children also scored more than 4 points lower on standardized intelligence tests a