New data shows that air quality across the United States is dropping after many years of improvement. Over the last two years, the U.S. had more polluted air days than just a few years earlier, official data showed. The information was collected by the Environmental Protection Agency, or EPA, and examined by the Associated Press. Climate experts say it is too early to know whether the recorded drops are the beginning of a long-term situation. But health officials say it is troubling to see the changes following years of progress. In 2017 and 2018, there were 15 percent more unhealthy air days than in the previous four years, the data shows. The 2013-2016 period saw the fewest number of unhealthy air days the U.S. had ever had since at least 1980. Air quality is affected by a complex mix of conditions, both natural and man-made.
Title: US Air Quality Dropping After Years of Improvement
Content: <div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/60b790f4-84b1-487d-bd7c-3038ac34b990_hq.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='US Air Quality Dropping After Years of Improvement' data-article-id='3939'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='10000'>New data shows that air quality across the United States is dropping after many years of improvement.</span> <span data-start-time='10000' data-end-time='21896'>Over the last two years, the U.S. had more polluted air days than just a few years earlier, official data showed. </span> <span data-start-time='21896' data-end-time='33479'>The information was collected by the Environmental Protection Agency, or EPA, and examined by the Associated Press.</span> <span data-start-time='33479' data-end-time='45271'>Climate experts say it is too early to know whether the recorded drops are the beginning of a long-term situation. </span> <span data-start-time='45271' data-end-time='54583'>But health officials say it is troubling to see the changes following years of progress.</span> <span data-start-time='54583' data-end-time='68750'>In 2017 and 2018, there were 15 percent more unhealthy air days than in the previous four years, the data shows. </span> <span data-start-time='68750' data-end-time='82271'>The 2013-2016 period saw the fewest number of unhealthy air days the U.S. had ever had since at least 1980.</span> <span data-start-time='82271' data-end-time='92479'>Air quality is affected by a complex mix of conditions, both natural and man-made. </span> </p></div><div 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thoroughly'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/investigate_thoroughly.wav'><span>investigate thoroughly</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/to_barter_or_trade.wav'><span>to barter or trade</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/a_genre_of_literature.wav'><span>a genre of literature</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/the_belief_in_a_god_or_higher_power.wav'><span>the belief in a god or higher power</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=13160 data-hint-location='45271' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/but_health_officials_say_it_is_troubling_to_see_the_changes_following_years_of_what.wav'>But health officials say it is troubling to see the changes following years of what?</div><div class='choices' data-correct-choice='progress'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/progress.wav'><span>progress</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/regression.wav'><span>regression</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/confusion.wav'><span>confusion~</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/failing.wav'><span>failing</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=13161 data-hint-location='82271' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/air_quality_is_affected_by_a_complex_mix_of_conditions_both__blank__and_manmade.wav'>Air quality is affected by a complex mix of conditions, both <span class='blank'>natural</span> and man-made.</div><div class='choices' data-correct-choice='natural'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/imaginary.wav'><span>imaginary</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/natural.wav'><span>natural</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/animated.wav'><span>animated</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3458/plastic.wav'><span>plastic</span></div></div></div><div class='question-buttons'><button 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