How to make ventilation and indoor air healthier

Very relevant in the context of covid risk and poor air quality in many India cities. Do review the attached from science magazine and share your views what u are doing at home and work to make indoor air healthier friends more  

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Very critical issue....5000 trees fell in Kolkata last year during Amphan cyclone......situation would be similar elsewhere...we need to plant trees in our own premises or on rooftops...balconies... On Fri, 06 Aug 2021 13:07:10 +0530 Vinita Agrawal wrote > more  
The air cooling system incorporated in this building should be 'CLOSED SYSTEM', that means treating & recirculating the same air in the building. Designers normally have the option of bypass line through which cooling system draws outside fresh air at regular intervals and discard the contaminant air. The level of air contamination shall be enabled using a proper sensor in the system. It is dangerous to use outside fresh air directly in a crowded place or in closed room more  
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