Gas alarm industry is relatively concentrated. The top three manufacturers have 34.48% sales revenue market share in 2016. Tyco International, which has 12.15% market share in 2016, is the leader in the gas alarm industry. The manufacturers following Tyco International are MSA and Industrial Scientific, which respectively has 11.98% and 10.35% market share. The Riken Keiki is the leader of Japan gas alarm industry. It sells a total of 197 million dollar gas alarm products in the year of 2016.