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Background In the southern hemisphere summer of 2019-2020, Australia experienced its most severe bushfire season on record. Smoke from fires affected 80% of the population, with large exceedances of the Australian National Air Quality Standard for particulate air pollution recorded in all major population centres during this period. We examined if emerging and innovative digital technology can assist extreme smoke-affected populations to reduce their exposure and protect their health. Methods AirRater is a free smartphone app that tracks air quality and user symptoms in near real-time. We distributed an online survey to over 13,000 app users to assess how they used this information during the 2019-20 bushfire season, and if the app was helpful in decision-making around reducing personal smoke exposure. Results We received responses from 1732 users (13.3%). Respondents reported that the app was highly useful, supporting informed decisions regarding daily activities during the smoke-affected period. Commonly reported activities supported by information provided through the app were staying inside (76%), rescheduling or planning outdoor activities (64%), changing locations to less affected areas (29%) and informing decisions on medication use (15%). Conclusions Smartphone apps enable users to reduce smoke exposure and protect their health by providing individual-level and location-specific data. Furthermore, digital technology such as AirRater provides the potential to provide insight into the community impacts of environmental hazards such as bushfire smoke. Key messages Smartphone apps enable users to reduce their smoke exposure and protect their health. These emerging technologies can help public health authorities to understand the community impact of environmental hazards.

Can digital technology help reduce smoke exposure and protect health in extreme air quality events?