Explanation

World Mosquito Day, observed annually on 20 August, is a commemoration of British doctor Sir Ronald Ross's discovery in 1897 that female anopheline mosquitoes transmit malaria between humans. 

Explanation

World Heath Day: 7 April

Theme 2025: Healthier beginnings, hopeful futures

Explanation

World Patient Safety Day is observed annually on 17th of September 

Theme 2020: Health Workers Safety priority for patient safety

Theme 2022: Medication Safety

Theme 2023: Engaging patients for patient safety

Explanation

World Heritage Day is observed on 18 April. 

Theme 2022: Heritage and Climate

Theme 2023: Heritage Changes 

Explanation

World Science Day for peace and Development is celebrated on November 10.

Theme 2022: Basic Sciences for Sustainable Development

Explanation

International Day of Radiology is observed on November 8.

Theme 2020: Radiologists and radiographers supporting patients during COVID-19.

Theme 2021: Interventional Radiology – Active care for the patient

Theme 2022: Radiologists & Radiographers Supporting Patients

Explanation

• World Hydrography Day is observed on June 21 every year to raise awareness about hydrography and the essential role that it plays in improved knowledge of the seas and oceans.
• Theme 2021: One hundred years of international cooperation in hydrography
• Theme 2022: Hydrography - contributing to the United Nations Ocean Decade

Explanation

• World Aspergillosis Day is observed on 1st February every year.

• Aspergillosis is an infection.

• Aspergillosis Day was first observed in 2018.

• 1 February 2022 marks the 5th Aspergillosis day.

Explanation

The United Nations General Assembly in 2012 declared 5 September as the International Day of Charity. This day is observed to spread awareness among people, NGOs, and stakeholders to assist those in need. 

Explanation

 International Day of Happiness is celebrated on 20 March. 

Theme 2021: Happiness For All, Forever

Theme 2022: Be calm, Be wise and Be Kind

Theme 2023: Be Mindful, Be Grateful, Be Kind 

Theme 2024: Reconnecting for Happiness: Building Resilient Communities

Theme 2025: Caring and Sharing