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Dangerous smoke from hundreds of Canadian wildfires has seeped down to the U.S., impacting over 100 million Americans across more than a dozen states.

Air quality alerts on Friday stretch from the Midwest to the Great Lakes to the Northeast to the Mid-Atlantic, impacting major cities including Chicago, Detroit, Washington, D.C., and Philadelphia.

Canada has nearly 900 wildfires burning, with over 200 categorized as out of control.

Heavy rain by the Minnesota/Canada border on Friday may help with some fires, but the storms could also bring strong winds and lightning, which can spark new fires and create more erratic fire activity.

Passing showers and thunderstorms are also possible in Ontario Friday, but that rain won’t be enough to put the wildfires out, and the winds may make conditions worse and lightning could spark new wildfires. There are more chances for rain over Ontario on Saturday and again on Tuesday.

In the U.S., the smoke Friday spans from Duluth, Minnesota, to Richmond, Virginia, impacting states including Wisconsin, Michigan, Ohio, New York, Pennsylvania, New Jersey, Maryland and Delaware.

Philadelphia issued a “Code Purple Air Quality Emergency Day” Friday.

“Everyone may experience negative health effects from particulate matter in the air,” Philadelphia officials warned. “Members of sensitive groups may experience more serious health effects.”

The worst air quality Friday afternoon is in northern Minnesota and Wisconsin.

In Milwaukee, where the air is in the hazardous category, the Milwaukee Brewers are allowing ticket holders to exchange tickets for Friday night’s game for another regular season home game.

In Cleveland, the Guardians postponed Friday night’s home game due to the air quality. The game against the Pittsburgh Pirates will be rescheduled as part of a split double header on Saturday, the team said.

The air is expected to improve on Saturday in the Ohio Valley, Northeast and the Mid-Atlantic, when rain moves in. But parts of the Midwest and Great Lakes will continue to see dangerous air quality.

Smoke is probable over New York City on Sunday when Spain plays Argentina in the FIFA World Cup Final at MetLife Stadium in New Jersey, though it is still too early to know exactly where the smoke will be. Sources familiar with the situation told ABC News that “all involved authorities are monitoring.”

Smoke contains fine particles that can travel deep into the lungs. For those who need to work outdoors, are more sensitive to smoke or are in a high-risk group, Kai Chen, an associate professor of epidemiology at Yale School of Public Health, told ABC News that the best type of mask to wear is an N95, which is designed to filter at least 95% of airborne particles.

A massive 8.8 magnitude earthquake struck off Russia’s Pacific coast, triggering tsunami warnings and evacuations along the Hawaiian coast, and alerts were also issued along the U.S. West Coast.

The powerful earthquake, which struck about 85 miles off the east coast of Russia’s Kamchatka Peninsula, is one of the strongest ever recorded and the largest in the world since 2011 .

American influence

In the United States, the initial tsunami waves crashed onto the Hawaiian island of Oahu, forcing people to evacuate.

Authorities urged residents to leave beaches and low-lying areas for higher ground and to take shelter on at least the fourth floor of buildings. As part of a statewide warning system, sirens will sound every 10 minutes across the Hawaiian Islands for three hours before the projected impact.

Hawaii Governor Josh Green told reporters earlier Wednesday that the state “has not seen any serious consequences” and called it “a huge relief.”

Tsunami warnings were also issued for other parts of the U.S. Pacific – coastal areas of Alaska, Oregon, Washington and California – but those have now been lifted.

Tsunami waves were recorded overnight in Monterey and San Francisco, California, but did not cause serious problems.

In California, tsunami warnings were issued for Santa Barbara and San Luis Obispo counties, as well as Los Angeles and Ventura counties.

Tsunami warnings were also issued for the U.S. territories of Guam and American Samoa, but have since been lifted.

Crescent City, located on the border of California and Oregon, has since lifted all tsunami warnings. It was the last area in the United States to do so on Wednesday morning. Local officials said waves peaked at about 3.5 feet (10 meters) high, and no casualties have been reported so far.

The earthquake also affected travel; Hawaiian Airlines and Alaska Airlines resumed flights Wednesday morning after suspending them due to tsunami warnings.

Tsunami warnings and alerts around the world

In Russia, a camera captured the eruption of Klyuchevskaya Sopka, the region’s highest peak, with hot lava flowing down its western slopes.

The earthquake triggered a tsunami warning across northern Japan, forcing the evacuation of more than 2 million people.

Japan’s Meteorological Agency warned that a tsunami of about 3 feet high was expected to hit Hokkaido. The agency later lowered the tsunami alert level to a lower level, but said people still needed to remain vigilant.

Elsewhere in the Pacific, French Polynesia, Samoa, the Solomon Islands, Fiji, the Marshall Islands, Kiribati, New Caledonia, the Cook Islands, Nauru, Australia and the Philippines issued varying levels of tsunami warnings, as well as advisories predicting strong currents and possible flooding, but these have now expired.

In Central and South America, tsunami warnings or alerts were issued for Chile, Peru, Ecuador, Costa Rica, Mexico, Guatemala, El Salvador and Colombia.

ABC News’ William Gretzky, Anthony Trott, Mireya Villarreal, Tanya Stukalova, Clark Bentsen and Jessica Gorman contributed to this report.

Editor’s note: This article has been updated to correct a reference to data from the U.S. Geological Survey, which said Tuesday’s 8.8 magnitude earthquake was among the 10 strongest since 1900.