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The other gases in the group are much less common in the atmosphere .</p> </div> </div> </section> </li> </ul> <div class="hero-slideshow__nav"> <div class="l-constrain js-hero-slideshow__nav"><button type="button" class="hero-slideshow__nav-button">1</button></div> </div> </div> <div> <div > </div> </div> <div class="usa-section"> <div class="l-constrain"> <div class="l-grid l-grid--3-col l-column-layout"> <div> <div class="box"> <h2 class="box__title"> Sulfur Dioxide Basics </h2> <div class="box__content"> <ul> <li><a href="/so2-pollution/sulfur-dioxide-basics#what is so2">What is SO<sub>2</sub> and how does it get in the air?</a></li> <li><a href="/so2-pollution/sulfur-dioxide-basics#effects">What are the harmful effects of SO<sub>2</sub>?</a></li> <li><a href="/so2-pollution/sulfur-dioxide-basics#reduce">What is being done to reduce SO<sub>2</sub> pollution?</a></li> </ul> </div> </div> <div class="box box--related-info"> <h2 class="box__title"> Other Common Air Pollutants </h2> 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