Unfortunately, air fresheners including the plug in type are not safe. A lot of people do not understand how dangerous they can be and do not think twice about using them around their tanks (or family members).
Here are two articles that list some of the reasons why and all the chemicals that are in them (and there are dozens more articles out there).
https://www.google.com/amp/s/health...12/10/amp/chemical-air-scenting-products.aspx
https://www.naturallivingideas.com/plug-in-air-freshener-dangers/
Here are some of the chemicals listed in the second link:
“Harmful Chemicals Found in Air Fresheners
Air fresheners in both aerosol sprays and plug-ins contain a number of toxic chemicals that are dangerous to your pet's health and yours, including:
• Volatile organic compounds, or VOCs, such as acetone, ethanol, pinene and acetate, some of which are inherently toxic. When these substances react with the ozone in the air, they generate a range of secondary pollutants such as formaldehyde and ultrafine particles. Ultrafine particles have been linked to heart and lung disease and
respiratory problems.
In fact, a 2011 news report released by the American College of Allergy, Asthma and Immunology (ACAAI) linked the VOCs in air fresheners with a 34 percent increase in health problems in people with asthma.1
• Formaldehyde is a known carcinogen that has been definitively linked to cancers of the nose and throat. It is also known to cause ongoing irritation of the throat and airways, potentially leading to secondary infection, nosebleeds,
asthmaand other respiratory ailments.
• Naphthalene has been shown to cause inflammation, but as well as tissue damage and cancer in the lungs of rodents.
•
Phthalates are linked to a disruption in hormone levels, poor semen quality, birth defects and reproductive harm.
• 1,4-Dichlorobenzene (1,4-DCB) has been linked to compromised lung function and liver cancer in mice.”