As the NSW bushfires roll into their sixth week, Sydneysiders are feeling the health impacts of hazardous air pollution levels, fear for loved ones living in fire-affected areas and general uncertainty about the future.

People are noticing the differences on an individual level. But an analysis of big data shows the abnormal bushfire season has starkly changed how Sydney dwellers are living and going about their daily lives as their city fades from view under a smoky haze.