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When is ozone bad for us?
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Ozone can be bad for us when it is in the air we actually breathe (troposphere), and in a concentration high enough to either damage lung tissues (> 1ppm), or cause inflammation that makes a condition like asthma worse (as little as 0.8ppm).

Ozone can damage plant leaves, which will cause them to make less oxygen, and adversely affect whatever crops we depend on from them. Marigolds make ozone from their roots when attacked by parasites, so even plants use ozone.

Ground level ozone is a respiratory irritant, and can aggravate the respiratory tract and also asthmatic conditions.

Ozone exposure has been linked to permanent damage to lung tissue, aggrevation of asthma symptoms, and plaque formation in the blood stream (hardening of the arteries).

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