Statements A, B, D, E and F are correct and together describe key sources, controls and dynamics of urban air pollution. Vehicular and industrial sources, construction and waste burning all add pollutants, while standards provide benchmarks for acceptable levels. Indoor biomass use and meteorological conditions influence overall exposure and dispersion. Statement C is clearly wrong because PM2.5 exposure is strongly associated with respiratory and cardiovascular diseases. Hence, the combination that includes all true statements and excludes C is A, B, D, E and F only.
Option A:
Option A is correct because it captures every true statement (A, B, D, E, F) and omits only C, which wrongly denies health impacts of PM2.5. It reflects a comprehensive picture of sources, health effects, standards and dispersion processes in urban air quality.
Option B:
Option B is incorrect as it leaves out E and F, ignoring the roles of indoor sources and weather conditions. Although A, B and D are true, this option provides an incomplete understanding of how urban air pollution is shaped and experienced.
Option C:
Option C is incorrect because it includes C, which claims that long-term PM2.5 exposure has no significant health effects. This contradicts epidemiological evidence, so the combination mixes correct and incorrect statements.
Option D:
Option D is incorrect since it omits statement A, thereby underplaying the importance of vehicular emissions as a major source. It also fails to mention that industrial and indoor sources plus weather dynamics all matter for urban air quality.
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