Pollution affects respiratory functions, especially asthma. Poor air quality also affects the brain, see: Biodermography and Population Health.
Pollution is said to affect cognition, those smoggy and hazy days affect vulnerable populations in particularly, older persons who live in highly congested areas.
A study from the American Journal of Epidemiology (June 2014) revealed people over 50, who lived in areas with high amounts of fine particulate matter like smoke and haze, performed poorly on cognitive tests as those who lived in less populated areas, (Neurology Now/Apr-May 2016).
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The Healthy & Unhealthy Brain!