In recent years, Kolkata has emerged as one of India’s most polluted urban centres, with PM2.5 — fine particulate matter less than 2.5 microns in diameter — posing a serious threat to public health. A new study by the Centre for Research on Energy and Clean Air (CREA) also revealed that nearly one-third of Kolkata’s PM 2.5 pollution is caused by secondary pollutants.

While primary pollutants such as road dust, vehicular exhaust, and industrial smoke are visible contributors, it is the secondary pollutants, formed through complex atmospheric reactions, that are turning into an invisible public health crisis.

What Are Secondary Pollutants?

Unlike primary pollutants, which are directly emitted from identifiable sources, secondary pollutants are formed when gases like sulfur dioxide (SO₂), nitrogen oxides (NOx), and volatile organic compounds (VOCs) react in the atmosphere. In the case of PM2.5, these include secondary inorganic aerosols like ammonium sulphate and ammonium nitrate, and secondary organic carbon derived from chemical transformations of organic gases. According to the CSIR-NEERI 2019 report, secondary ammonium sulphate alone contributes up to 50% of PM2.5 in Kolkata and Howrah.

Sources Driving Secondary Pollution

The formation of secondary pollutants in Kolkata is closely tied to the region’s urban dynamics. The key contributing sectors include:

Transportation: Vehicles emit NOx and VOCs that contribute to secondary aerosol formation. Transport exhaust accounts for over 23% of PM2.5 emissions in Kolkata.

Households: Combustion of biomass and low-grade fuels emit a cocktail of pollutants. Households contribute nearly 28% of the PM2.5 burden in the city.

Industries: In Howrah, industries are responsible for a staggering 52% of PM2.5 emissions, a large share of which includes precursors to secondary particles. Many of these small-scale industries use outdated, inefficient coal-fired systems.

Construction activities: As detailed in the Urban Climate report, dust from excavation, concrete mixing, and demolition not only contributes to PM10 and PM2.5 but also releases silica particles and heavy metals, which undergo transformation in the air to form secondary pollutants. PM2.5 levels at such sites have been recorded up to 14 times higher than background levels.

Health Risks and Human Exposure

The danger posed by secondary PM2.5 pollutants is grave. These particles are small enough to bypass the respiratory system’s defenses and lodge deep in the lungs. According to health risk assessments conducted across Kolkata’s 12 monitoring stations, including Serampore, Bidhannagar, and New Town, Hazard Quotients (HQs) exceed the safety threshold in almost all locations. Particularly in Bidhannagar, the HQ for infants reached 1.56 — meaning their exposure to PM2.5 is 56% higher than the safe limit.

This overexposure is linked to:

• Respiratory and cardiovascular diseases
• COPD, asthma, and bronchitis
• Reduced lung function in children
• Increased mortality and morbidity, especially among vulnerable groups like children, pregnant women, and construction workers

For construction workers in Kolkata, the risks are compounded. Exposure to respirable silica, a byproduct of concrete grinding and drilling, leads to irreversible illnesses such as silicosis and lung cancer. Studies show quartz levels during construction activities often far exceed safe occupational limits.

Urgent Need for Targeted Action

Despite regulatory efforts — like phasing out older vehicles and implementing synchronized traffic lights — PM2.5 levels in Kolkata consistently breach the WHO and Indian air quality standards for up to 8 months a year. This indicates that current strategies are insufficient to tackle secondary pollution.

Sleep is one of the most important pillars of health. How much you sleep, what times as well as how well you sleep are things that heavily affect your body and lifestyle. Many people think sleep is something they can always recover from. Stayed up too late but still going to work early in the morning? Or you slept on time but woke up due to some issue, making you unable to sleep the rest of the night. These are issues we have all faced, and we figure that we’ll sleep when our day ends.

However, this is not an issue to be taken lightly, as researchers found that lack of sleep can essentially shorten your lifespan.

A 2025 study published in Springer Nature Link have found a clear link between how long you sleep and your risk of dying. They say there's a "golden window" of two hours that most people should aim for to stay healthy and avoid bad consequences. To figure this out, scientists looked at almost 80 past studies, which included information from over two million people, giving them a lot of data to understand sleep patterns better.

Dangers of Too Much (or Too Little) Sleep

The research shows risks for both sleeping too little and sleeping too much. If you regularly sleep for more than nine hours each night, you could face a 34% higher risk of death. On the other hand, those who sleep for less than seven hours faced a 14% increased risk of dying. This ideal sleep range matches what health groups like the NHS suggest for most healthy adults, though it's noted that everyone's needs can be a bit different based on things like age.

Why Long Sleep Might Be a Warning Sign

The study's authors, from a university in Hungary, think that sleeping too much might actually be a sign of hidden health problems. For example, if someone has a heart issue that hasn't been found yet, it could make them feel extra tired, causing them to sleep more. This means the higher risk isn't just from the sleep itself, but possibly from an underlying sickness. Interestingly, women who slept over nine hours had an even higher risk – 41% greater – compared to women who got a normal amount of sleep.

Perfect Amount: 7 to 8 Hours

After looking at all that information from millions of people, the research strongly points to sleeping between seven and eight hours as the best amount for staying healthy. This time seems to be just right for your body and mind to rest and work well. However, the researchers did notice that different studies on long sleep times sometimes showed slightly different results. This means we might need more research to fully understand all the ways sleeping too much can affect our health and specific causes of death.

Why Good Sleep Matters for Everything

A good night's sleep is absolutely essential and does much more than just make you feel rested. It helps your mental health, gives you enough physical energy for your day, and keeps your brain sharp so you can think and focus clearly. Health experts also warn that ongoing sleep problems can negatively affect your relationships, social life, and even simple daily tasks. These continuous issues can make you feel constantly tired, lead to eating more, and make you less productive at work or school.

Can You Recover Lost Sleep?

Recovering lost sleep is not as simple as you may think it is. The more hours you lose, the more you accumulate sleep debt. Sleep debt, according to the Sleep Foundation, is the difference between the amount of sleep you need and how much you are actually getting.

While short naps (10-20 minutes) can refresh you, and sleeping in on weekends might feel good, they often aren't enough for true recovery. Research shows it can take four days to bounce back from just one hour of lost sleep, and even longer to fully erase "sleep debt" and restore your body's normal function. Your brain needs more than a weekend to recover fully from ongoing sleep restriction.

Celebrities go through extreme amounts of scrutiny, constantly living under pressure and having to stomach all their personal feelings in order to continue their work. Olivia Munn is no stranger to this feeling. The American actress recently opened up about struggling with an uncommon condition that was triggered due to a paparazzi shot.

She revealed she lives with trichotillomania, a lesser-known mental health condition. This news comes after her public battle with breast cancer, highlighting her continued openness about her health journey.

“I did the horrible thing, which was to read the comments... And they were like ‘I think she set this up!’” In a recent episode of ‘Armchair expert’ podcast, Munn shared that her trichotillomania began after an incident with paparazzi between 2009 and 2010 when she was dating Chris Pine. The insensitive comments turned out to be a trigger for her, and she explained it was the beginning of her condition.

What is Trichotillomania?

Trichotillomania, also called trich or TTM, is a condition where people have strong, repeated, and uncontrollable urges to pull out their hair. This hair can come from their scalp, eyebrows, or other body parts. Munn explained that the urge to pull can be quite intense and it is a sensation that feels like “oh this eyelash feels like its going to come out, even though it is not”. Once you pull it, she details, there is a small second of pain, then satisfaction followed up with immediate regret.

The National Health Services UK explains that people with trichotillomania often feel a certain sensation. They feel a lot of tension building up until they pull, and once they do, they often feel a sense of relief. Sometimes, hair pulling happens when someone is stressed, but it can also happen without them even thinking about it. While most people pull hair from their head, some also pull from their:

• Eyebrows
• Eyelashes
• Genital area
• Beard or mustache

Bald patches may appear unusually shaped and affect one side of the head more than the other. Trich can lead to feelings of shame and low self-esteem, often causing individuals to try and conceal their condition.

What Causes Trichotillomania?

The exact causes of trichotillomania are not entirely clear, but potential factors include:

Coping mechanism

For some, pulling hair might be a way to deal with strong emotions like stress or anxiety. It could be a kind of self-soothing behavior.

Chemical imbalance

There might be differences in the brain's chemicals that affect how a person controls urges or handles rewards, making it harder to stop pulling hair.

Hormonal changes

Changes in hormone levels, especially during puberty when the condition often starts, could also be a factor.

Genetics

If someone in your family has trichotillomania, you might be more likely to develop it too, suggesting that genes could play a part.

Can Trichotillomania Be Treated?

The main way to treat trichotillomania is through a therapy called habit reversal training, which is a type of cognitive behavioral therapy (CBT). This therapy focuses on helping you replace the urge to pull your hair with something harmless. It typically involves keeping a diary to track when and where you pull your hair, which helps you identify and understand your triggers – the specific situations or feelings that make you want to pull.

Once you know your triggers, you can work on replacing the hair-pulling action with a different, less harmful behavior, like squeezing a stress ball or making a fist. Support from loved ones is also a key part of this process, providing encouragement as you work to change the habit. Other self help tips according to NHS are,

• Squeeze a stress ball or similar object.
• Form a fist and tighten arm muscles.
• Use a fidget toy.
• Wear a bandana or a tight-fitting hat like a beanie.
• Take a soothing bath to reduce stress or anxiety.
• Practice deep breathing until the urge subsides.
• Exercise regularly.
• Apply plasters to fingertips.
• Cut hair short.

While summer season hits US, with record high heat already engulfed parts of United States so far, with sunny brunches, impromptu beach excursions, and lazy, stress-free days outdoors. But with the rise in temperature and UV index, your skin has a special set of problems—consider sweat-caused breakouts, dehydration, and the constant threat of sun damage. Whereas glowing skin is the season's go-to accessory, attaining and sustaining it takes more than a splash of water or swipe of sunscreen. The seasonal shift demands an strategic revamp of your skincare routine, designed specifically for summer's particular needs.

Most people maintain the same skincare routines throughout the year, yet what works in winter could fail in summer. Hot, humid weather increases oil production, clogs pores, and heightens the risk of dehydration and sunburn. The right summer routine is about making smarter, climate-aware choices: featherweight hydration, targeted serums, and robust UV protection. Summer's longer days and soaring temperatures may boost your mood, but they’re also hard on your skin. Increased exposure to the sun’s UV rays can accelerate aging, cause hyperpigmentation, and damage the skin barrier. Toss in sweat, humidity, and pollution, and your skin's defense system is put to the test.

Dermatologists caution that neglecting these environmental stressors can result in premature fine lines, pores clogged by grime, and irregular tone. The secret? Steering clear of aging skincare habits and swapping them out for summer-smart solutions.

"Are you cleansing enough?" That's what Chief Dermatologist Dr. Shwetha Rahul thinks should be the motto for every summer skincare routine. When it's summer, skin sheds more oil, which—if combined with sweat and grime—can block pores quickly.

STEP 1- Cleansing

"Twice daily gentle cleansing is a must," says Dr. Rahul. "But steer clear of harsh scrubs or over-cleansing, which can leave the skin defenseless and even more vulnerable to the sun."

Choose sulfate-free, pH-balanced cleansers that eliminate dirt without tampering with your skin's natural barrier. Gel or foam cleansers are particularly effective on oily and combination skin.

STEP 2- Hydration

One of the largest myths about summer skincare is that you can forego moisturizer. In fact, summer's heat and humidity have a dehydrating effect on your skin, with added sweating and sun damage to boot. Trade in your heavier moisturizers for a lightweight, water-based or gel moisturizer that seals in moisture without being greasy or pore-clogging. Opt for non-comedogenic products containing hyaluronic acid, glycerin, or ceramides to keep your skin soft and strong.

"Moisturizing doesn't become optional just because the weather is warm," maintains Dr. Rahul. "In fact, dehydration does occur in summer, particularly following sun exposure."

Check for products containing hyaluronic acid, glycerin, and aloe vera. For more serious hydration, treatments such as Profhilo or PRP microneedling can restore lost moisture and trigger collagen.

STEP 3- Sunscreen

Whether you’re brunching outdoors or lounging at the beach, sunscreen is your skin’s best defense against premature aging, hyperpigmentation, and sunburn. Choose a broad-spectrum SPF 30 or higher, and reapply every two hours when outdoors. Antioxidant-enriched formulas offer extra protection against environmental stressors and help keep your skin evenly toned and healthy.

A golden tan may look appealing, but the long-term effects of unprotected sun exposure are far from pretty. Wrinkles, sunspots, and increased skin cancer risk are all linked to UV radiation.

Sunscreen—broad-spectrum, SPF 30 or higher—is non-negotiable. But it’s not just about applying it once in the morning. “Reapply every two hours, especially if you’re swimming or sweating,” Dr. Rahul advises. “Choose antioxidant-rich formulations to fight off free radical damage.”

And don't miss forgotten areas such as ears, feet, and the back of your neck.

STEP 4- Moisturize

Heavy moisturizers and high-coverage foundations can suffocate your skin during summer. The result? Clogged pores, acne, and dullness.

Ditch heavy moisturizers and heavy foundations and switch to light serums, liquid sunscreens, and light BB creams. "Heavy makeup creates a film that holds on to sweat and bacteria. Summer is the time when your skin needs to breathe," advises Dr. Rahul.

STEP 5- Rejuvenation

Sustained sun exposure can leave the skin dry and drained. Brightening serums containing vitamin C or niacinamide brighten the skin, reduce pigmentation, and reduce sun damage. After-sun treatments like aloe vera gel or soothing facial mists calm the irritation and restore lost water.

Professional treatments such as microneedling with Platelet-Rich Plasma (PRP), bio-remodelling injectables such as Profhilo, and LED Light Therapy are becoming increasingly popular due to their capacity to stimulate collagen, improve elasticity, and achieve a dewy, natural look without heavy makeup. These treatments promote deep hydration and discreet repair, minimizing the visibility of fine lines and keeping your skin firm and perky.

Hydration From the Inside Out

Hydrating 8–10 glasses of water a day and consuming water-filled foods such as cucumbers, watermelon, and oranges keep the skin elastic and prevent dryness. Optimal hydration promotes your skin's protective barrier, removes toxins, and postpones premature aging signs.

Summer Skin Issues—and How to Correct Them

Breakouts: Excess oil and sweat can block pores. Exfoliate with gentle acids and use non-comedogenic products.

Sunburn: Cool with fragrance-free moisturizers and aloe vera; skip active ingredients until the skin settles down.

Hyperpigmentation: Prevent and address with daily sunscreen, niacinamide, and vitamin C serums.

Oily Shine: Blotting papers and mattifying primers keep oil under control; change to oil-free moisturizers.

Dehydration: Apply humectants such as hyaluronic acid and hydrate with lots of water to keep your moisture barrier intact

Summer skincare isn't all about appearance; it's about shielding and caring for your skin to keep it healthy, strong, and radiant through every brunch or beach day. By changing up your routine for the season—emphasizing gentle cleansing, intelligent hydration, sun protection, and light textures—you can sidestep snags and maintain a radiant complexion all summer.

As Dr. Shwetha Rahul concludes, "It is crucial to take care of your skin during the summer season in order to prevent common errors that will damage it. By maintaining a consistent skincare routine and using proper products and treatments, you can keep your skin safeguarded, moisturized, and refreshed."

A summer skincare routine is not just about avoiding sunburn or acne—it's about loving your skin through its changing needs and providing it the attention that it needs. From the beach to brunch, your skin is always on high exposure to heat, UV rays, and air pollution.