As wildfire smoke becomes a frequent summer hazard across large parts of the US, knowing the risk at the neighborhood scale matters for human health.

Wildfire smoke from Canada has triggered air quality alerts across New York and the Northeast, with hazy skies and unhealthy conditions expected through today.

New York was hit with an air quality alert Saturday as smoke from Canadian wildfires drifted across the state, pushing levels of fine particulate pollution into the unhealthy range for sensitive groups.