Spring heralds the pollen season, and those with allergies are probably already suffering the effects of hay fever. But climate change is supercharging pollen and making allergies worse, not least because in some regions the season is starting earlier and lasting longer. But there's an even greater threat looming on the horizon: thunderstorm asthma.
This extreme weather phenomenon literally pours billions of pollen grains down on people, causing severe respiratory problems and even death. Click through and learn more about this frightening combination of
pollens and weather conditions.