World Ozone Day is celebrated on
$16^{th}$ September
$21^{st}$ April
$5^{th}$ June
$22^{nd}$ April
Explanation:
World Ozone day is celebrated on $16^{th}$ September.
$5^{th}$ June - World Environment Day
$21^{st}$ April - National Yellow Bat Day
$22^{nd}$ April - National Earth Day
World Ozone day is celebrated on $16^{th}$ September.
$5^{th}$ June - World Environment Day
$21^{st}$ April - National Yellow Bat Day
$22^{nd}$ April - National Earth Day