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Severe thunderstorms bringing rain and high winds took down many trees and power lines across Massachusetts Tuesday night, causing scattered outages across the state as showers lingered overnight, officials said.

A severe thunderstorm watch for the state expired at 10 p.m., 90 minutes after the end of a severe thunderstorm warning for much of Eastern Massachusetts.

Reports of damage and power outages caused by the storm trickled in as it moved east. There were 600 electric customers across the state without power at about 7 a.m. early Wednesday morning, according to the Massachusetts Emergency Management Agency’s online outage map.

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The strongest winds were concentrated near the Massachusetts Turnpike, the weather service said.

In Boston, the storms caused firefighters to respond to reports of “numerous” downed trees and power lines across the city, the Fire Department said in a tweet.

The storm caused delays for some MBTA trains, with a downed tree near Central Avenue slowing the Mattapan Trolley and shuttle service replacing trolleys on the D branch of the Green Line between Reservoir and Riverside stations due to downed branches near Reservoir, the agency wrote on Twitter.

In Cambridge, a tree fell on a home in the area of 7 Newton St. while a branch or wire landed on a car, said Jeremy Warnick, a Cambridge police spokesman. A tree also caught fire in the area. No injuries were reported.

“These are among the many calls generating responses right now due to the storms,” he wrote in a statement.

At one point Tuesday night, every fire company and two marine units were committed to emergencies in the city, the Cambridge Fire Department said.

Police in Quincy received multiple reports of trees down, causing outages across the city.

“Assume all downed power lines are live!” police wrote on Twitter.

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In Wellesley, police reported a large tree down blocking a road, and in Upton, police closed Main Street due to wires down in the roadway. Malden police encouraged residents to seek shelter immediately

Firefighters in Spencer responded to a structure fire caused by a lightning strike in North Brookfield, the Spencer Fire Department wrote on Twitter.

An air quality alert first issued Monday was also extended in limited parts of the Massachusetts until midnight Tuesday, as a plume of smoke from massive wildfires in the Western United States and Canada lingered over parts of the state.

The Department of Environmental Protection included all of Massachusetts on Monday and until noon Tuesday, but later narrowed down the area of concern to northern Worcester, northwest and central Middlesex and Essex counties. The air quality alert in those areas will remain in effect until midnight, the DEP said shortly after noon Tuesday.

“The air is expected to be Unhealthy for Sensitive Groups,’' the DEP said. “While much of the smoke is aloft, some of the plume is mixing down to the surface and increasing fine particle levels.”

The DEP said the primary concern was for “sensitive groups” including “people with heart or lung disease such as asthma, older adults, children, teenagers, and people who are active outdoors.”

Moreover “people with either lung disease or heart disease are at greater risk from exposure to particle pollution.”

By Tuesday afternoon, the three DEP monitoring sites in Boston were all reporting moderate air quality issues. “Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people’' according to the DEP definitions. “Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.”

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Similar health concerns were reported in Rhode Island Monday, but the air quality was expected to improve by Tuesday night, according to the Rhode Island Department of Environmental Management.

Weather conditions Tuesday were hot, with temperatures in the 80s, creating the right conditions for thunderstorms to help push the smoky air out of the region, according to the National Weather Service. Temperatures are also expected to drop to the low to mid-70s Wednesday following Tuesday night’s storms.

“Some showers may linger Wednesday morning and it will be quite a bit cooler than today. Another period of unsettled weather is expected sometime Thursday into early Friday,’' forecasters wrote. “Dry and pleasant weather is expected to start this weekend.”

Correction: An earlier version of this story incorrectly described the National Weather Service’s thunderstorm alert.


Charlie McKenna can be reached at charlie.mckenna@globe.com. Follow him on Twitter @charliemckenna9. John R. Ellement can be reached at john.ellement@globe.com. Follow him on Twitter @JREbosglobe.