Air quality has fluctuated Monday from moderate to unhealthy.
Henderson suggested using portable air cleaners indoors to keep the air as clean as possible during smoky conditions. Normal levels are below 10 parts per million.
"Wholesale improvement to air quality is not likely until midweek".
An Air Quality Health Advisory for Wildfire Smoke is in effect for northeastern Colorado - including Denver, Boulder, Fort Collins and Greeley - until 4 pm Monday.
While he can't say if the current air quality is the worst ever seen in the region, Ries says the current levels are among the worst recorded with modern equipment. For comparison, Beijing and Mumbai - two cities renowned for typically poor air quality - scored 47 and 50 respectively. However, it's not only B.C. struggling with hazy skies. "Everybody has to breathe, so everybody's exposed".
And although surgical masks may give people a sense of security, Saxton said they are not an effective filter for fine particulate matter, which is so small it "can penetrate deep into the lungs".
"A mask is only going to clear smoke for you if it's fitted correctly".
A shift in winds on Sunday brought in wildfire smoke from British Columbia and the Cascades.
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Over the last week, all three Prairie provinces have been under special air quality statements for high smoke concentrations.
Thousands of BC firefighters are getting help from colleagues from other Canadian provinces as well as from fire crews from Mexico, Australia and New Zealand.
A province-wide state of emergency has been in effect since August 15.
Hundreds of residents are either under evacuation orders or are being warned that they should be ready to leave their homes at a moment's notice.
Benenati said yellow emojis can be concerning to people who have asthma.
The Shovel Lake fire is considered to be one of the highest priorities for firefighters.
Reduced visibility caused by the smoke and haze is making it hard for officials to detect new fires and for crews to fight existing wildfires from the air.
The north end of Vancouver Island is covered by the advisory as well. Authorities believe five of the six were sparked by lightning and the sixth by human activity. This can become unsafe at times with easterly winds throughout B.C.