英语翻译

问题描述:

英语翻译
我想说"是否pm2.5是空气污染物中最致命的物质",写成"Is the pm2.5 the most deadly substance in all air pollutant"对吗

1.Is pm2.5 the most deadly substance among all the air pollutants?
2.Among all the air pollutants,is pm2.5 the most deadly substance?