The jet-stream is going wonky (scientific term). Pollutants from Asia drift over to North America in approx. 5 days. I believe that all the major climate events are connected to global warming and man's output of carbon and use of fossil fuel.
The costs of this are already mounting in human cost, loss of life and in financial cost of rebuilding and preparing for further and worse events to come.
Make the industries pay for their part in this. Better yet stop the proliferation of fossil fuel.