As devastating wildfires continue to burn across the western states of California, Oregon, and Washington, hazy skies and smoke are being reported as far away as Toronto and New York.

These hazy conditions are not mere annoyances. As Luke Montrose, an environmental toxicologist, wrote recently for Fast Company, air pollution from wood smoke is a serious public health concern. Smoke from large wildfires can travel thousands of miles, across states, countries, and even oceans, and the fires currently burning on the West Coast include some of the biggest ever recorded.

To get a sense of how far smoke from the current wildfires is traveling, you can turn to a number of interactive maps and data tools that let you track smoke conditions in real time. I’ve rounded up some useful options below:

• AirNow: This fire and smoke map is “designed to provide the public with additional information on levels