Full story
Smoke Spreads, Health Alerts
Thick wildfire smoke from Canada blanketed major U.S. cities across the Midwest, Northeast and mid-Atlantic, driving dangerous air quality to more than 100 million people.
“03:42 01:05 01:24 02:11 03:22 03:14 52:05 26:50 20 Minutes with AFP Published July 17, 2026 at 10:05 AM • Updated July 17, 2026 at 10:52 AM A real pea soup”
CNN said “More than 100 million people in 18 states and the District of Columbia are under air quality alerts,” and the air quality stretched from northeast Minnesota to southeast Virginia.
The Hill reported that shifting winds pushed thick haze into major metro areas across the Great Lakes, Northeast and Mid-Atlantic, reducing visibility and sending pollution levels into unhealthy and even hazardous ranges.
CNN said the polluted air will last through at least Saturday in some areas as new waves of smoke waft south, while ABC7 New York reported air quality reached an AQI of 173 early Saturday, a level considered unhealthy for everyone.
The Hill tied the alerts to fine particulate matter, noting that air quality alerts are triggered when levels of fine particulate matter, known as PM2.5, become high enough to pose health risks.
World Cup, Thunderstorms, Masks
As the World Cup final approached, meteorologists said thunderstorms passing through would mostly clear the smoke from the New Jersey area just in time for the match on Sunday at MetLife Stadium in East Rutherford, N.J.
PBS quoted Tyler Roys, a senior meteorologist at AccuWeather, saying “This storm front will largely move the smoke out of the northeast before the final between Spain and Argentina,” and Jeff Berardelli, chief meteorologist and climate specialist at WFLA-TV, said the storm front would “sweep the atmosphere clean.”
Al Jazeera reported that the air quality index forecast showed an improvement from unhealthy air to “moderate” air quality for sensitive groups from Saturday to Sunday in East Rutherford, which it said means little to no health risk for the general public on the day of the final.
CNN described how officials urged people to stay indoors and use masks, including a Chicago mayor’s office post saying “Please stay indoors, and if you must go outdoors, use a well-fitted N95 or KN95 mask for your safety.”
In New York City, ABC7 New York said residents were encouraged to limit prolonged time outdoors and avoid strenuous activities like running or exercising outside, as shifting winds continued to push smoke across the region through midday.
Fire Numbers, PM2.5, Forecast Uncertainty
Beyond the immediate haze, The Hill said the Canadian Interagency Forest Fire Centre (CIFFC) indicated 949 active fires as of Saturday afternoon across all but one of Canada’s 10 provinces and three territories.
The Hill reported that the bulk of that activity is in Ontario and the Northwest Territories, with those two areas accounting for more than one-third of active fires, and it said the only Canadian province with no active wildfires is Prince Edward Island.
NBC News described how the Environmental Protection Agency uses the Air Quality Index to assess how polluted the air is, saying scores of 100 or more (out of 500) mean the air is unhealthy and could harm people’s health.
NBC News also explained that wildfire smoke consists of microscopic particulate matter, ash and trace minerals, and it said small particulate matter, called PM2.5, is the most dangerous because it can be deeply inhaled, penetrating the lungs and even entering the bloodstream.
For the World Cup weekend, Forbes said the air quality forecast for East Rutherford, New Jersey, where the final will take place, was currently favorable for the start of game time Sunday with a moderate air quality index of 80, while also noting that factors in air quality forecasting can be “quite unpredictable.”
