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WASHINGTON, D.C. (CBSDFW.COM/AP) – The Obama administration is proposing stricter emissions limits on ozone, a pollutant that leads to smog and is linked to asthma and respiratory illness. The proposal calls for new ozone limits of between 65 parts per billion and 70 parts per billion, with the final level to be set next year.

Because of existing pollution controls and emissions regulations, the Environmental Protection Agency projects that all but nine counties are positioned to meet a standard of 70 parts per billion in 2025 without taking any additional steps.

Of the nine counties across the country that won’t meet the standard, outside of California, five are in Texas, two are in Connecticut, and one each in Maryland and New York.

Brazoria County (Texas)

Population: 329,137

Projected air quality in 2025: 74 parts per billion

Harris County (Texas)

Population: 4,259,951

Projected air quality in 2025: 74 parts per billion

Dallas County (Texas)

Population: 2,415,058

Projected air quality in 2025: 71 parts per billion

Tarrant County (Texas)

Population: 1,884,216

Projected air quality in 2025: 75 parts per billion

Denton County (Texas)

Population: 710,841

Projected air quality in 2025: 72 parts per billion

Sources: Environmental Protection Agency, 2013 population estimates

Air North Texas has more information about local air quality and each year promotes and participates in Clean Action Air Day.

(©2014 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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