[KarlInOhio]

Let me see: Global warming leads to more allergens. It doesn't say what they are, but if more heat and carbon dioxide lead to it, I would have to assume that they are taling about an increase in plants and especially their pollen.

But one of their cures is:

Something can be done to help those most at risk of this looming epidemic, Epstein told reporters.

"Green" buildings with rooftop gardens,

Maybe they can plant some ferns or something else without pollen.

[ScaniaBoy]

More asthma and allergy in northern Sweden with its clean, cold air than in the southren parts including cities like Stockholm, Gothenburg and Malmo.

Less incidence of asthma in Poland where brown coal is major fuel (major pollution source) than in Western Europe.

Lots of facts to explain...