• Real Estate Developer has begun marketing air as a health-and-wellness amenity, the same way builders of yore pitched hot tubs or home gyms.

• For buyers at the upper reaches of the real estate market, peace of mind can be purchased in the form of deluxe air filtration systems that keep the world at bay. Lower income communities are not so lucky.

• “Suddenly it’s a topic of conversation,” Gambino, a luxury real estate agent, said. For two of his biggest recent sales — a $14.1-million house in the San Fernando Valley and a $23.5-million house in Brentwood — he said deluxe filtration systems helped seal the deal.

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