ID 313817525 © Stokdrozdirina | Megapixl.com
Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
alert aql category cause caution clean concentration danger dirty disease dust effect emission environment factory guide guideline hazard health high illness index level limit location monitoring pm pollution poor protection quality respiratory risk serious smog smoke standard toxic warning banner notification word background sign acceptable