Resumo

CORTEZ-LUGO, Marlene et al. Association between light absorption measurements of PM_2.5 and distance from heavy traffic roads in the Mexico City metropolitan area. Salud pública Méx [online]. 2013, vol.55, n.2, pp.155-161. ISSN 0036-3634.

OBJECTIVE: To study the relationship between light absorption measurements of PM_2.5 at various distances from heavy traffic roads and diesel vehicle counts in Mexico City. MATERIALS AND METHODS: PM_2.5 samples were obtained from June 2003-June 2005 in three MCMA regions. Light absorption (b_abs) in a subset of PM_2.5 samples was determined. We evaluated the effect of distance and diesel vehicle counts to heavy traffic roads on PM_2.5 b_abs using generalized estimating equation models. RESULTS: Median PM_2.5 b_abs measurements significantly decrease as distance from heavy traffic roads increases (p<0.002); levels decreased by 7% (CI95% 0.9-14) for each 100 additional meters from heavy traffic roads. Our model predicts that PM_2.5 b_abs measurements would increase by 20% (CI95% 3-38) as the hourly heavy diesel vehicle count increases by 150 per hour. CONCLUSION: PM_2.5 b_abs measurements are significantly associated with distance from motorways and traffic density and therefore can be used to assess human exposure to traffic-related emissions.

Palavras-chave : Carbon; vehicle emissions; roads; diesel exhaust; Mexico.

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