An Air Quality Alert and Heat Advisory are in effect for Whatcom County through Thursday, with wildfire smoke from Canada expected to reach unhealthy levels and temperatures near 90 degrees in parts of the county.
Residents with private water systems drawing from Lake Samish are advised to be aware of increased microcystin levels, a cyanotoxin from blue-green algae, following recent water tests. Public Health warns that not all algae blooms are dangerous, but some can produce toxins that cause illness in people and pets.
The alerts follow a similar advisory issued July 20, with this week's alert specifically noting Wednesday and Thursday as peak days for heat and smoke impact.