Fig. 4.
Diurnal variation of a surface CO, b surface NOx, c BC, and d surface O3 during pre-lockdown, lockdown1.0, lockdown 2.0, lockdown 3.0, lockdown 4.0, and unlock-1 at Bhubaneswar
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.