Table 1.

Objectives and methodologies to be used for the mixed methods study.

Objective		Methods	Techniques	Analysis
Phase 1: Sample selection		Quantitative	Electronic questionnaire	Descriptive
Phase 2
	To describe the study participants’ perceptions of air pollution in Bogotá	Qualitative (descriptive)	Semistructured interview	Categorization and coding
	To measure physical activity in healthy volunteers	Quantitative (cross-sectional)	Measurement of vital signs, anthropometry, accelerometry (METsa)	Descriptive and bivariate
	To estimate the changes in lung volumes and respiratory symptoms of users according to the mode of transportation	Quantitative (cross-sectional)	Symptom questionnaire and spirometry	Descriptive and bivariate
	To determine the concentrations of PM2.5b and BCc in the evaluated microenvironments	Quantitative (cross-sectional)	PM2.5 and BC levels in real time	Descriptive and bivariate
	To identify relationships among the variables of exposure to environmental pollutants, perception of air quality, and respiratory health in study participants	Qualitative and quantitative	Triangulation	Triangulation

^aMET: metabolic equivalent of task.

^bPM_2.5: fine particulate matter.

^cBC: black carbon.