Environmental Damage to Hair

Hair, an appendage of the skin, is remarkably resilient but susceptible to damage from various environmental factors. Understanding these aggressors is crucial for maintaining hair health and developing effective protective strategies. Environmental damage to hair primarily manifests as alterations to the hair shaft, affecting its structural integrity and aesthetic qualities.

Understanding the Hair Shaft

To comprehend environmental damage, it's essential to understand the basic structure of the hair shaft. Each strand of hair consists of three main layers:

• Cuticle: The outermost layer, composed of overlapping, scale-like cells. It protects the inner layers from damage and contributes to shine.
• Cortex: The middle and thickest layer, containing keratin proteins, which provide strength and elasticity, and melanin, which gives hair its color.
• Medulla: The innermost core, present in some but not all hair types, and its function is not fully understood.

Environmental factors typically target the cuticle first. When the cuticle is compromised, the cortex becomes vulnerable, leading to greater damage.

Ultraviolet (UV) Radiation

Sunlight, specifically its UV component, is a pervasive environmental aggressor. Both UVA and UVB rays can damage hair.

• Mechanism: UV radiation initiates photochemical reactions within the hair shaft. It degrades melanin, leading to color changes (lightening or brassiness), and breaks down keratin proteins, especially tryptophan, cysteine, and methionine. This degradation weakens the disulfide bonds and peptide bonds that give hair its strength and structure.
• Effects: Reduced tensile strength, increased porosity, dryness, brittleness, rough texture, split ends, and dullness. Colored hair is particularly vulnerable to fading.
• Protection: Physical barriers like hats or scarves, and haircare products formulated with UV filters. These filters work by absorbing or reflecting UV radiation before it can reach the hair shaft.

Humidity

Humidity, referring to the amount of water vapor in the air, can have both beneficial and detrimental effects on hair.

• High Humidity:
  • Mechanism: Hair is hygroscopic, meaning it absorbs moisture from the air. In high humidity, the hair swells as water molecules penetrate the cuticle and cortex. This swelling can disrupt the organized structure of keratin fibers, causing them to distort.
  • Effects: Frizz, loss of curl definition, limpness, and sometimes a sticky or heavy feeling. For chemically treated or damaged hair, the cuticle may lift excessively, leading to increased frizz.
• Low Humidity:
  • Mechanism: In very dry air, hair loses moisture to the environment, leading to dehydration.
  • Effects: Dryness, static electricity, brittleness, and a lack of luster.
• Management: Balancing moisture levels with humectant-containing products in dry climates, and anti-humectant or curl-defining products in humid climates.

Pollution and Airborne Particulates

The air we breathe, especially in urban or industrial areas, contains various pollutants that can affect hair health.

• Mechanism: Microscopic particles, including dust, soot, smoke, and industrial chemicals and gases (e.g., sulfur dioxide, nitrogen dioxide), can deposit on the hair shaft and scalp. These particles can contain heavy metals or free radicals that initiate oxidative stress, damaging proteins and lipids in the hair and scalp.
• Effects: Increased dryness, dullness, loss of shine, weakened hair strands, scalp irritation, and potentially increased hair shedding. Pollutants can also lead to a buildup on the hair, making it feel rough or dirty.
• Protection: Regular cleansing with a clarifying shampoo to remove buildup, and the use of antioxidant-rich haircare products to neutralize free radicals.

Extreme Temperatures

Both excessive heat and cold can negatively impact hair.

• Heat (e.g., styling tools, hot water):
  • Mechanism: High temperatures denature keratin proteins, meaning they alter their natural structure. This can lead to the formation of microscopic bubbles within the hair shaft, weakening it. Excessive heat also rapidly evaporates moisture, leading to dehydration and cuticle lifting.
  • Effects: Brittleness, frizz, split ends, breakage, and dullness. The hair loses its natural elasticity and ability to retain moisture.
• Cold (e.g., harsh winter weather):
  • Mechanism: Cold air often lacks humidity, leading to dehydration. Strong winds can also physically abrade the cuticle, causing damage and tangles.
  • Effects: Dryness, static hair, increased fragility, and breakage.
• Protection: Using heat protectants before heat styling, avoiding excessively hot water for washing, and protecting hair from harsh winds and extreme cold with protective styles or head coverings.

Chloride and Salt Water

Exposure to chlorinated pool water and salty ocean water can also compromise hair health.

• Chlorine:
  • Mechanism: Chlorine is a strong oxidizing agent. It reacts with keratin proteins, weakening the hair structure and stripping away natural oils. It can also react with minerals to cause discoloration, particularly in lighter or chemically treated hair.
  • Effects: Dryness, brittleness, green discoloration (from copper in water reacting with chlorine), and increased porosity.
• Salt Water:
  • Mechanism: Salt water is hypertonic, meaning it draws moisture out of the hair through osmosis. The salt crystals left on the hair after drying can also abrade the cuticle.
  • Effects: Extreme dryness, tangles, dullness, and a crunchy texture.
• Protection: Wetting hair with clean water and applying a leave-in conditioner before swimming to saturate the hair and create a barrier. Rinsing hair thoroughly immediately after swimming.

Summary of Environmental Damage and Protection

Environmental Factor	Mechanism of Damage	Hair Effects	Protection Strategies
UV Radiation	Degrades melanin & keratin; breaks disulfide bonds	Dryness, brittleness, color fade, weakness	Hats, UV filters
High Humidity	Hair swells, disrupts keratin structure	Frizz, loss of definition, limpness	Anti-humectant/defining products
Low Humidity	Dehydration; loss of moisture from hair	Dryness, static, brittleness	Humectant-containing products
Pollution	Particle deposition; oxidative stress	Dullness, dryness, reduced strength, scalp irritation	Regular cleansing, antioxidants
Extreme Heat	Denatures keratin; rapidly evaporates moisture	Brittleness, frizz, split ends, breakage	Heat protectants, avoid hot water
Extreme Cold	Dehydration; cuticle abrasion by wind	Dryness, static, fragility	Head coverings, protective styles
Chlorine	Oxidizes keratin; strips natural oils	Dryness, brittleness, discoloration	Wet hair before swimming, leave-in conditioner
Salt Water	Draws out moisture; salt crystal abrasion	Extreme dryness, tangles, dullness	Wet hair before swimming, rinse after swimming

By understanding these environmental aggressors and their specific impacts, individuals can implement targeted strategies to minimize damage and maintain the health and vitality of their hair. Consistent protective measures and appropriate haircare are key to mitigating the cumulative effects of environmental exposure.

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Find these ingredients in Watermans products

• Copper — you will find this ingredient in our Hair Vitamins.