A group of rural women in Jharkhand is mapping air pollution in the coal belt. Ten women use portable air quality monitors in Dhanbad and Bokaro districts. They are called Paryavaran Sakhis, or friends of the environment. The women identified 26 air pollution hotspots. They collected data across 10 panchayats. Their study is titled Impact of Air Pollution on Health. ASAR and Deshaj Abhikram documented the report. The women found the most polluted spots were anganwadis and health centres. Young children spend the whole day at anganwadis. Sick people visit health centres constantly. Both groups are already vulnerable. The monitors gave the women exact data for the first time. They now know how bad their air quality is. Within months of publishing their findings, coal companies took action to cut pollution. Sushma Devi, 43, leads the monitoring in her village Parjoria. She rides an electric two-wheeler to take readings. The initiative shows how grassroots data can force change. It also highlights the health cost of coal mining. The women plan to keep monitoring their villages.