Spencer Platt/Getty Images(NEW YORK) -- Hazy and dangerous fumes from ongoing Canadian wildfires have engulfed the skies over most of the Northeast coast, prompting serious air quality alerts.
Thirteen states have issued those alerts as the thick fumes block the sky and send people indoors.
Canadian officials said firefighters are scrambling to put out the blazes in Quebec, where more than 160 forest fires are currently active.
Here's how the news is developing. All times Eastern:
Jun 07, 8:14 PM EDT New York City's 'smoke wave' response time for warnings criticized
As New York City was bombarded with dangerous air and smoke that turned the skyline orange, some residents and environmental experts questioned if the city's leader acted quickly enough to warn people about the dangers of the "smoke wave."
The city's Office of Emergency Management issued warnings on its social media pages and city alert system starting Tuesday afternoon and Mayor Eric Adams put out a news release about the dangerous air quality around 11:30 p.m.
Some environmentalists said the late notice was unacceptable given that the city's environment was already showing poor visibility and unhealthy air earlier in the morning.
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-ABC News' Ivan Pereira
Jun 07, 7:21 PM EDT When to expect air quality to improve in the US amid Canadian wildfires
The wind conditions that are bringing plumes of smoke south are expected to last for several more days, experts say, as some fires in Canada continue to burn out of control.
The smoke is primarily from several wildfires burning in Quebec that is being blown south in a narrow band by an intense storm system around Nova Scotia that has not moved in several days, according to Mark Wysocki, an air pollution meteorologist who teaches at Cornell University in Ithaca, New York.
-ABC News' Meredith Deliso
Jun 07, 7:01 PM EDT What to know about the Air Quality Index from wildfire smoke and how it affects human health
Wildfire smoke contains fine particulate matter, known as PM2.5, which are microscopic solid or liquid droplets -- often 30 times smaller than the diameter of a human hair -- that can be inhaled and cause serious health problems, according to the EPA.
PM2.5 is considered unhealthy for "Code Orange" and sensitive groups once the Air Quality Index surpasses 100, according to AirNow, a website that publishes air quality data. Once the AQI surpasses 150, it is considered "Code Red," unhealthy for some members of the general public who may experience health effects, with sensitive groups experiencing more severe effects.
-ABC News' Julia Jacobo
Jun 07, 6:44 PM EDT NYC air quality deteriorates to new record level: Mayor
New York City Mayor Eric Adams updated residents on the current situation with the dangerous air quality due to the Canadian wildfires.
He said the city's Air Quality Index, or AQI, hit 484, the highest level on record, on Wednesday afternoon. Anything above 300 is considered hazardous, according to Zachary Iscol, the commissioner for the city's Office of Emergency Management.
"Tomorrow things may improve but an AQI over 150 is still considered dangerous," he told reporters.
Adams said all outdoor events in the city were canceled Thursday and urged private groups to do the same.
A person wears a face mask as smoke from Canadian wildfires blankets New York, June 7, 2023. "The best thing is that [people] remain indoors," the mayor said.
He reiterated advisories to close windows and to wear a mask if anyone has to travel outside.
Schools were already planned to be closed Thursday, and no decision has been made about the rest of the week, according to the mayor.
Adams said the current forecast shows the situation should improve at the end of the week but warned that the situation can change.
"It is difficult to predict the movement of the smoke," he said.
Jun 07, 6:31 PM EDT New York to distribute 1 million N95 masks Thursday, governor says
One million N95 masks will be made available for people at state sites in New York on Thursday, Gov. Kathy Hochul announced on Wednesday.
Officials will distribute 400,000 masks at MTA stations, the Port Authority Bus Terminal, state parks and the Javits Center, Hochul said.
Approximately 600,000 masks will be available from NYS Div. of Homeland Security & Emergency Services, the governor said.
Hochul has urged New Yorkers to stay inside due to smoke from the Canadian wildfires.
Jun 07, 4:35 PM EDT MLB games postponed in NYC, Philadelphia
The MLB has postponed Wednesday night's games between the White Sox and the Yankees, set to take place in New York City, and between the Tigers and Phillies, set for Philadelphia.
The Phillies-Tigers game was moved to Thursday and the Yankees and White Sox will play a doubleheader on Thursday.
The WNBA said Wednesday night's game between the Minnesota Lynx and New York Liberty, which was to take place in New York City, has been postponed due to the air quality.
Jun 07, 4:13 PM EDT The forecast
More smoke is expected in the Northeast for the next few days.
The thickest smoke will drift south Wednesday afternoon and is forecast to envelop Philadelphia, Baltimore and Washington, D.C., Wednesday night and Thursday. These cities may see AQI levels reach the most severe “hazardous” level over the next 24 hours.
On Thursday afternoon, another round of smoke is expected to move over Lake Superior and into Cleveland, Ohio; Erie, Pennsylvania; and Buffalo, New York.
-ABC News' Dan Amarante
Jun 07, 3:55 PM EDT Why the poor air quality could cause a host of symptoms -- even in healthy people
Exposure to concentrated amounts of fine particulate matter can cause both short-term effects such as irritation of the eyes, nose and throat; coughing, sneezing; and shortness of breath, and long-term effects such as worsening asthma and heart disease, according to the Environmental Protection Agency.
Fine particles are able to enter the body through the eyes and lungs. Not everyone feels the same symptoms, and the pollution can exacerbate existing health issues, such as asthma and allergies, Peter DeCarlo, associate professor of environmental health and engineering, told ABC News.
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-ABC News' Julia Jacobo
Jun 07, 2:55 PM EDT New York City tops list of world's worst air quality rankings
New York City is topping the list of the world's worst air quality rankings by a landslide, according to IQ Air, which monitors air quality worldwide.
New York City reached 392 on the AQI Wednesday afternoon, which is in the worst category -- hazardous -- on the U.S. government’s air quality tracker. Wednesday shattered New York City's record for the highest AQI since records began in 1999.
Dubai and Delhi came in at No. 2 and No. 3 in the world with 168 and 164, respectively.
Jun 07, 3:34 PM EDT New Jersey closes state offices early
New Jersey's state offices closed early Wednesday as the air conditions worsened, Gov. Phil Murphy announced.
The governor has urged residents to limit their time outside.
Jun 07, 2:11 PM EDT NY issues another Air Quality Health Advisory for Thursday
New York state officials have issued another Air Quality Health Advisory for Thursday for the entire state with the exception of the Adirondacks.
Jun 07, 1:47 PM EDT How to stay safe from wildfire smoke
The most effective way to protect yourself during wildfire emergencies is to stay indoors or limit time outdoors when there is smoke in the air, according to the Centers for Disease Control and Prevention. This is especially important for those with heart or lung conditions who are at higher risk for adverse health effects.
If you can, try to avoid exercising outdoors until the air quality improves, especially those with underlying lung disease.
"People with asthma and people who already have lung disease or underlying lung problems, it can exacerbate that, it can irritate that. And if the air quality is bad enough, it can even cause some symptoms of feeling unwell and respiratory symptoms in people who are healthy," said Dr. Stephanie W