Vehicular Air Pollution,Playgrounds, and Youth Athletic Fields

In spite of epidemiological evidence concerning vehicular air pollution and adverse respiratory/cardiovascular health, many athletic fields and school playgrounds are adjacent to high traffic roadways and could present long-term health risks for exercising children and young adults. Particulate matter (PM₁,0.02–1.0 μm diameter) number counts were taken serially at four elementary school athletic/playground fields and at one university soccer field. Elementary school PM₁ measurements were taken over 17 days; measurements at the university soccer field were taken over 62 days. The high-traffic-location elementary school field demonstrated higher 17-day PM₁] than the moderate and 2 low traffic elementary school fields (48,890 ± 34,260, 16,730 ± 10,550, 11,960 ± 6680, 10,030 ± 6280, respective mean counts; p < .05). The 62-day mean PM₁ values at the university soccer field ranged from 115,000 to 134,000 particles cm^{? 3}. Lowest mean values were recorded at measurement sites furthest from the highway (～34,000 particles cm^{? 3}) and followed a second-order logarithmic decay (R² = .999) with distance away from the highway. Mean NO₂ and SO₂ levels were below 100 ppb, mean CO was 0.33 ± 1.87 ppm, and mean O₃ was 106 ± 47 ppb. Ozone increased with rising temperature and was highest in the warmer afternoon hours (R = .61). Although the consequence of daily recess play and athletic activities by school children and young athletes in high ambient PM₁] conditions has not yet been clearly defined, this study is a critical component to evaluating functional effects of chronic combustion-derived PM exposure on these exercising schoolchildren and young adults. Future studies should examine threshold limits and mechanistic actions of real-world particle exposure.