<section><h2>Optical topic 3b quiz</h2><p><p>This quiz will recap on the concepts in Topic 3b - Aerosols</p></p></section><section><h2>How does optical EO identify specific gas species in the atmosphere?</h2></section><section><h3>Optical EO uses what to measure the quantity of aerosols in the atmosphere?</h3></section><section><h3>Increasing NOx levels over China and elsewhere observed from the GOME and SIAMACHY instruments was due to?</h3></section><section></section><section></section>