Caused by wildfires in Canada: [https://gothamist.com/news/smoke-from-wildfires-in-canada-continues-to-afflict-nycs-air-quality](<https://gothamist.com/news/smoke-from-wildfires-in-canada-continues-to-afflict-nycs-air-quality>)
I guess what has been happening in California will also happen on the East Coast.