The Real Culprit: Humidity, Mould, and Mildew
That distinct 'rainy season smell' is primarily caused by a spike in humidity. During the monsoon, the air becomes saturated with moisture, and this dampness seeps into our homes. It gets absorbed by walls, furniture, carpets, and clothes. This moist,
warm, and poorly ventilated environment is the perfect breeding ground for mould and mildew, which are types of fungi. As these fungi grow and multiply in hidden corners, behind cupboards, or within fabrics, they release microbial volatile organic compounds (mVOCs), which produce that tell-tale earthy, musty odour. So, what you're smelling isn't just damp air; it's the byproduct of fungal growth.
Let Air and Sunlight In
The simplest and most effective first step is to improve ventilation. Trapped air holds moisture, so creating airflow is crucial. Whenever the rain takes a break, open your windows and doors to allow for cross-ventilation. This helps to push the damp, stale air out and bring fresh air in, reducing moisture buildup. Even a few hours of sunlight can make a significant difference. Sunlight is a natural disinfectant that helps kill mould spores and dry out damp spots. Make it a point to open the doors of your wardrobes and cabinets during this time to let the air circulate inside.
Actively Absorb Excess Moisture
In a climate with high humidity, ventilation alone may not be enough. You need to actively remove water from the air. A dehumidifier is an excellent investment for this, as it draws moisture out of the air, making the environment less hospitable for mould. For a more budget-friendly and natural approach, you can use materials that are hygroscopic, meaning they absorb moisture. Place bowls of sea salt or uncooked rice in damp corners, closets, or rooms; they will pull moisture from the air. Activated charcoal is another fantastic option, as it not only absorbs moisture but also purifies the air and neutralises odours.
Use Natural Odour Neutralisers
Instead of masking the smell with artificial air fresheners, use natural ingredients to eliminate it. A bowl of white vinegar left in a room can absorb musty smells over a few days. Baking soda is another powerful deodoriser; you can sprinkle it on carpets and upholstery, let it sit for about 30 minutes, and then vacuum it up. Burning camphor (kapur) is a traditional Indian method that works wonders. Its strong scent and anti-fungal properties help purify the air. Simply light a few pieces in a fire-safe container and let the smoke fill the room for about 15-30 minutes.
Protect Your Wardrobe and Linens
Cupboards are notorious for developing musty smells during the monsoon, which then transfers to your clothes. Avoid packing clothes too tightly to allow for some airflow. Place moisture absorbers like silica gel packets, bags of chalk, or neem leaves between your clothes. Neem is a natural disinfectant that can help keep fungus away. Camphor pouches or balls are also highly effective in small, enclosed spaces like wardrobes and shoe racks. If you must dry clothes indoors, ensure it's in a well-ventilated area, as damp laundry is a major source of indoor humidity.
Keep Surfaces Clean and Dry
Regular cleaning is more important than ever during the monsoon. Frequently wipe down surfaces, especially in the kitchen and bathroom, to prevent moisture from settling. Pay attention to walls and corners for any signs of mildew growth—small black or green spots. If you spot any, clean the area with a solution of white vinegar and water. For floors, consider using an anti-bacterial cleaning liquid. It's also a good idea to store away thick carpets and rugs for the season, as they can trap a significant amount of moisture and become a source of foul smells.
