Welcome to Airwaves, a weekly roundup of the most important events and stories in the indoor air quality world. Here are some headlines for the week of June 21, 2023:

Today is the first day of summer in the northern hemisphere, and scientists are reporting new data suggesting heat waves have released a dangerous amount of ozone into the atmosphere.

Meanwhile, as we reported last week, wildfires are making air pollution a hot topic in the U.S. and Canada, where cities like New York and Philadelphia have recorded some of the world's unhealthiest air in recent days. Current events aside, here is a list of the world's 20 worst cities for air pollution.

Thankfully, no American cities made the list. However, we at IAQ recently analyzed nine publicly available datasets to project which of the 100 largest U.S. cities have the worst indoor air pollution. The results may surprise you. 

Regardless of where you live, you can always find out what's in your indoor air with IAQ. Act now and get an IAQ on Indiegogo for up to 60% off retail price. 

Stay cool and breathe easy.