Air quality

A heat advisory is in effect until Tuesday evening.

Beyond Housing received a $20,000 grant from the American Water Charitable Foundation to help curb illegal dumping and replant trees in parts of north St. Louis county. The grant will also help with trash cleanups, tree maintenance and the removal of invasive bush honeysuckle.

Missouri health advocates say a recent decision by the U.S. Environmental Protection Agency to review its current ozone air quality standards will delay efforts to improve air quality.

Washington University scientists say smoke particles from wildfires may damage health and contribute to climate change more than experts had realized.

A haze is still lingering over sections of the region as a result of wildfires that continue to burn in parts of Canada, but a sign showing poorer than usual air quality in St. Louis caught our newsroom's attention a bit before we began covering the impact of the fires locally.

As wildfires burn in eastern Canada, smoke and pollutants drift over the heavily impacted Northeast and into the Midwest. Poor air quality levels in Iowa, Kansas, Missouri and Nebraska, may be hurting people with more sensitive breathing conditions.

Even when skies are clear, air pollution can affect the health of sensitive groups.

A St. Louis environmental group wants to help urban farmers in north St. Louis and north St. Louis County monitor air quality. Climate Changents are placing air monitoring machines that test fine particulate matter on urban farms and schools.

Early in the coronavirus pandemic, concentrations of a harmful air pollutant dropped by more than 30% on average worldwide, Washington University researchers have found.

Over the next two years, the Nature Conservancy in Missouri will plant 100 trees in parts of north St. Louis County to help reduce air pollution and flooding.