Archive for July 5th, 2018

Dr. Jeff Masters  ·  July 2, 2018, 1:26 PM EDT An unusually concentrated plume of African dust invaded the U.S. over the weekend, bringing dangerously high levels of fine particulate pollution (PM2.5, particles less than 2.5 microns or 0.0001 inch in diameter). The dust from the Saharan Air Layer (SAL) arrived in Texas on Thursday, […]