Every March, the air in Chiang Mai becomes with smoke. Farmers burn their fields, and forest fires spread in the dry hills. This year, the pollution was bad. The sky turned a grey, and the sun looked like a orange coin. Grandma Bua began coughing . Ploy bought air for the café and kept the doors closed. Fewer customers came, because many people stayed . Tam called from the hills. A fire had come close to his coffee trees, and his neighbors had fought it through the night. Ploy felt watching the news. Ben explained that the smoke was a problem with no simple cause. Poor farmers burn fields because they cannot afford . So Ploy decided to use the café to raise . Jay designed posters about clean air, and the café donated part of its profits to a firefighting group. When the rains finally came in May, everyone breathed . Ploy knew the problem would return, but she felt less now.