Inevitably, fireworks start going off in the first week of July, even before the Independence Day holiday has begun.
They’re not just loud, says KPLU weather expert Cliff Mass, they’re dirty.
“We often see a spike at the air quality measuring stations of very small particles (of pollutants,)” Mass said.
He notes there is typically a gigantic jump in levels measured on the 4th of July later in the day.
“And some places it’s the worst air of the year,” he said.