Smog is known as summer problem, but soon spring and fall could become hazy, polluted seasons as well. According to a report released late last week by the Environmental Protection Agency, global warming could worsen smog and extend the length of its seasonal impact.

Government scientists said smog, a pollutant formed when vehicle emissions react with sunlight, will likely get worse in worse in the Northeast, lower Midwest, and mid-Atlantic, where many cities are already struggling to clean up their air. Smog has been linked to respiratory problems and has been proven to aggravate asthma.

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