An air-quality warning remains in effect for parts of Metro Vancouver and the Fraser Valley due to smog and wildfire smoke from a blaze that has prompted evacuation alerts for the Yale and Spuzzum areas.

It comes as Environment Canada warns that temperatures in the Fraser Canyon and South Thompson regions are expected to reach 37 to 39 C this week, posing a moderate risk to public health.

The smog warning spans eastern areas of Metro Vancouver as well as the central Fraser Valley, while the smoke warning covers eastern parts of the valley.

The regional district says the smog, also known as ground-level ozone, is the result of local emissions combining with hot and sunny weather, that saw temperatures hit a national high of 40 Celsius in Lytton on Sunday.

It says smoke from the Sailor B

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