Kaylee Pineda likes to be outdoors. She rides her bike, plays Little League baseball and enjoys swinging on the monkey bars at school. But when the wind picks up and the air turns hazy, she knows she needs to stay indoors. The dust can suddenly trigger her asthma and leave her gasping for air. “I feel like my chest tightens,” Kaylee said. “My heart starts pumping.” Kaylee, who is 9 years old, uses an inhaler every morning before going to school and every night before going to bed.