The primary health concern from wildfire smoke comes from the amount of very fine particulates in the air, smaller than 2.5 microns in diameter. The measure of this is commonly abbreviated as PM2.5.
As hot as the Earth's weather has been in recent years, it's about to get hotter: El Niño is on the way, with warmer sea temperatures promising new weather extremes, U.S. and international forecasters say.
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