Out door air pollution has been a problem since ancient Romans...but the industrial revouloution was when outdoor air pollution increased and it a significant problem...
hope this helps
Assuming you're running Windows, click the start button, and then search for "Device Manager" (or open CMD or PowerShell and type devmgmt.msc). Look at the list of devices. If Bluetooth is there, you have it; if it's not there, you don't.
the answer is the seconf one
What did you do? Write that as the first part