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Colorado urges people to avoid driving due to dangerous ground-level ozoneJune 26, 2025 -
More than one-third of Americans routinely breathe in unhealthy airApril 25, 2024 -
Hole in the ozone surpasses the size of AntarcticaSeptember 17, 2021 -
The air in KC is just a bit cleaner due to the stay-at-homeApril 28, 2020