COVID-19 lockdowns brought surprising news to scientists studying pollution: Cars spew much more ammonia into the air than previously thought. Ammonia is a common air pollutant that’s a major cause of lung and heart disease, especially in cities. “The tricky question has always been: How do we separate out ammonia concentrations owing to traffic from…  read on >  read on >

If you’re getting together with others outdoors, a windy day might be best, researchers say. The investigators found that when people socialize outside, the risk of coronavirus infection is as much as 45% greater when there’s hardly any breeze than when there are stronger winds. “The issue is really about an increased danger of infection…  read on >  read on >

Autism may be more prevalent among American children than believed, a new U.S. government study shows. One in 44 children at age 8 in the United States have been diagnosed with the developmental disorder, a jump from the previous estimate of 1 in 54 children, the U.S. Centers for Disease Control and Prevention report found.…  read on >  read on >

Children and teenagers vaccinated against the mumps virus have accounted for one-third of infections in recent years, a new U.S. government study finds. The reasons are unclear, and experts stressed that routine childhood vaccination remains the best weapon against mumps — a contagious infection that is usually mild, but can cause serious complications. After the…  read on >  read on >

Racism is “a public health threat” that must be tackled to end the global HIV/AIDS epidemic, the Biden administration said Wednesday in announcing its new strategy to fight the disease. Over generations, “structural inequities have resulted in racial and ethnic health disparities that are severe, far-reaching, and unacceptable,” according to the strategy released on World…  read on >  read on >