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Two helicopters, a CL-415 water bomber from Newfoundland and Labradorand 40 crew members continue to fight an out-of-control fire in Nova Scotia's Yarmouth County that has grown significantly since it began earlier this week.

The fire near South Horseshoe Lake in eastern Yarmouth County measured roughly 3,100hectares in size on Wednesday afternoon,according to a provincial official.

That's compared to about 1,000 hectares on Tuesday night, and anestimate of 25 hectares early Tuesday morning.

"The biggest challenge that crews and pilots are facing is the amount of smoke," KaraMcCurdy, wildfire prevention officer for the Department of Natural Resources, said in an interview Wednesday with CBC Nova Scotia's News at Six.

"[Yesterday] we couldn't see enough to measure the edges of it. Today we've had less smoke and we got a better handle of the size of it."

McCurdy said the fire, which began Monday afternoon,is still consideredout of control.

The fire is "actively still moving but with the humidity last night, overnight and this morning, it's around 80 per cent, and the light winds, that's going to help decrease the fire spread," McCurdytold CBC Nova Scotia'sInformation Morning.

Satellite images shared on social media showedsmoke from the wildfire drifting west across Yarmouth County and into the Gulf of Maine.

"The smoke certainly was an issue across the province and the smoke plume was moving into a lot of the communities down in Yarmouth County," said McCurdy.

She said in the last two days, there were roughly15 fires across the province which were the result of low humidity and high winds. However, they were extinguished quickly.

Currently, there are burn restrictions in the counties of Queens, Shelburneand Yarmouth.

Smoke from the fire has prompted air quality alerts for the Yarmouth area, according to a release issued Wednesday evening from Natural Resources and Renewables, and an incident command post is being established.

The department said Tuesday the fire is in a fairly remote area and at that point there was no risk to homes or businesses.

Natural Resources and Renewables Minister Tory Rushton said Wednesday that conditions are still adverse, so the fire may continue to spread.

"However, at this time, we do not see it reaching communities," he said."The province's response is being managed by highly trained professionals and fire crew members who are ready to respond at a moment's notice to keep us safe in case of emergency," said Rushton.

McCurdy said the province is still investigating the fire but it is confident it was caused by humans since there has been no lightning in the remote area in the past week.

"The only access to the area is by all-terrain vehicles. So it would have to be somebody either going out fishing or on an all-terrain vehicle and in the area," she said.

"It could have been somebody stopped for lunch and had a campfire,smoking along the riverbank, or it could have even been accumulation of debris on an exhaust on an all-terrain vehicle."

She said crews were pulled from the line for safety reasons as the CL-415 water bomber helped with firefighting efforts Tuesday.

McCurdy said firefighting gets called off at night because of theincreasedrisks for firefighters and limits on thesupport available.

"In these circumstances, the crews will often start work at first light and then work till dusk, and then DNR and the fire departments will monitor the active fire overnight and work to protect structures," said McCurdy.

She said the area is mostly peat bog and black spruce, which makes it difficult to walk through.

"It's almost like walking in deep snow, you know it was like walking on pillows. So it can be hard to walk through and get equipment to it and with this limited access, they're having to carry equipment or get it moved in by aircraft," said McCurdy.

DNR has mobilized its incident management team, which will be looking after resources and logistics, from strategy and tactics to food and water for crews.

"They're also looking at getting more resources inbe it equipment, hoses, and ground personnel," she said.

CBC meteorologist Ryan Snoddonsaid Wednesday's easterly winds are lighter than Tuesday's, and are set to continue to ease through the evening.

"Amarine air mass moved in overnight and will remain in place into this evening. The higher relative humidity should help at least somewhat to slow the spread of the fire today," he said.

While there is still a chance of drizzle into Wednesday evening, Snoddon said it's not significant enough to have any real impact on the fire. As the sunshine returns on Thursday, the relative humidity will drop into the 35-45 per cent range in the afternoon.

"As the sun rises, northwest winds in the 10-20 km/h range are on the way for Thursday," Snoddon said. "Those winds will pushsmoke from the fire towards Shelburne and Queens counties."

McCurdy said a timeline for getting the fire under control will depend on weather conditions, and crews are hopeful for rain in the forecast.

"Sunday is looking like our break. We're hoping by Sunday, it may give us that chance to get it under control. But as for getting the fire completely out, it's going to take quite a few weeks."

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Out-of-control wildfire in Yarmouth County now covers 3,100 hectares - CBC.ca