The announcement, made on the Google Nest Help page, states that air quality information will be displayed on the ambient screen of the Nest Hub devices. The AQI badge will be included in the clock/weather widget for users.
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Google states the reason for this new feature is the wildfire season currently afflicting several states, as well as increasing efforts to reduce air pollution. The company wants to inform people of the air quality in their area to better protect themselves and sensitive individuals from unclean air.