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As told by a windowblinds company....

they also make skylights

This is just straight up an advertisement...

Effects -> Affects. "Effects" is a noun.

Probably should have gone with the original title here...

If I live in a dense city with a lot of traffic, is the indoor air really worse than the air outside?

Some sort of well-maintained filtration system is the only way it could be better than the outside.

The Indoor Generation – How life indoor effects us