(CNN)Three major US cities being wreathed in smoke from massive wildfires now have the worst air quality of any big cities in the world, according to a monitoring group.

The air is so full of smoke in Seattle and San Francisco, it’s at “unhealthy” levels according to the Air Quality Index. Wildfire smoke and your health: Do you need to worry?Wildfire smoke and your health: Do you need to worry?Wildfire smoke and your health: Do you need to worry?“Everyone may begin to experience some adverse health effects,” the EPA says in its description of what that means. “Members of the sensitive groups may experience more serious effects.”But in Portland, Oregon, things are significantly worse. The air there is “very unhealthy,” meaning that anyone breathing it in, “may experience more serious health effects.” According to IQAir, a group which tracks global air quality, Portland, Seattle and San Francisco have the worst air quality of any major cities around the world. But things are even worse outside of the big cities, according to the EPA’s own air quality index trackers.Read MoreWildfires are ravaging the West coast.  Here's how you can help Wildfires are ravaging the West coast.  Here's how you can help Wildfires are ravaging the West coast. Here's how you can help Large swathes of Oregon, Washington state and even parts of British Columbia in Canada, are experiencing “hazardous” air quality. The EPA says the air quality in Salem, Oregon’s capital, is so bad that people need to stay indoors and reduce activity levels.Although the exact AQI levels are changing constantly in the region, it will remain at unhealthy to hazardous levels for a while.There doesn’t appear to be an end in sight for fires or the smoke. Forecasters believe both will stick around the Pacific Northwest for days to come.

Source Link:
https://www.cnn.com/2020/09/14/weather/wildfire-air-quality-trnd/index.html

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