علماء يحددون ملوثًا سيليكونيًا واسع الانتشار في الغلاف الجوي العالمي

13 مايو، 2026

من إعداد الذكاء الاصطناعي

اكتشف باحثون مستويات مرتفعة بشكل غير متوقع من ميثيل سيلوكسان، وهي فئة من مركبات السيليكون، في عينات هواء من مدن ومناطق ريفية وغابات حول العالم. وتربط الدراسة جزءًا كبيرًا من هذا التلوث بانبعاثات المركبات الناتجة عن إضافات زيت المحركات. ويحذر الخبراء من أن استنشاق البشر اليومي لهذه المواد قد يتجاوز التعرض لملوثات أخرى معروفة مثل مواد PFAS.

جاءت هذه النتائج من فريق بحثي في جامعة أوتريخت وجامعة جرونينجن. حيث قاموا بقياس مستويات هذه المركبات عبر مواقع في هولندا وليتوانيا والبرازيل. ووصلت التركيزات إلى 98 نانوجرام لكل متر مكعب في ساو باولو، وانخفضت إلى 0.9 نانوجرام لكل متر مكعب في إحدى الغابات الليتوانية. وقد شكلت هذه الملوثات ما نسبته 2 إلى 4.3 بالمئة من إجمالي الهباء الجوي العضوي في العينات التي تم اختبارها.

Study maps pesticide mixtures in Peru and finds higher cancer risk in high-exposure areas

27 أبريل، 2026 من إعداد الذكاء الاصطناعي صورة مولدة بواسطة الذكاء الاصطناعي تم التحقق من الحقائق

A study published in *Nature Health* reports a statistical link between environmental exposure to mixtures of agricultural pesticides and higher cancer risk in Peru. Using modeled pesticide dispersion from 2014 to 2019 and cancer registry data from 2007 to 2020 covering more than 150,000 cases, researchers found that people living in high-exposure areas faced, on average, about a 150% higher likelihood of cancer, with Indigenous and rural farming communities among those most exposed.

Land sources emit over 20 times more airborne microplastics than oceans

Researchers at the University of Vienna have determined that land releases more than 20 times as many microplastic particles into the atmosphere as the oceans, challenging prior assumptions. Their study, published in Nature, used global measurements to correct overestimated emission models. The findings highlight land as the dominant source, though uncertainties persist.

University of Michigan study finds lab gloves skew microplastics data

30 مارس، 2026 من إعداد الذكاء الاصطناعي

Researchers at the University of Michigan have discovered that common nitrile and latex lab gloves release particles resembling microplastics, potentially inflating pollution estimates. The study, led by Madeline Clough and Anne McNeil, traced contamination to stearates in the gloves during sample preparation. Switching to cleanroom gloves could reduce false positives significantly.

صحة

Study finds dozens of PFAS in cord blood from babies born in early 2000s

صحة

Nearly half of US children exposed to poor air quality, ALA warns

صحة

Study suggests microplastics may contribute to Alzheimer's and Parkinson's

Researchers propose glow-in-the-polymer approach to track microplastics inside living organisms

A research team has outlined a fluorescence-based strategy designed to make microplastics and nanoplastics visible inside living organisms, potentially enabling real-time tracking of how the particles move, change and break down in biological systems.

Pilot study finds microplastics in most prostate tumor samples, with higher levels than nearby benign tissue

25 فبراير، 2026 من إعداد الذكاء الاصطناعي تم التحقق من الحقائق

Researchers at NYU Langone Health reported detecting microplastics in prostate tumor tissue from a small group of men undergoing prostate removal surgery, with average concentrations about 2.5 times higher in tumor samples than in nearby noncancerous tissue. The team says the findings, scheduled for presentation Feb. 26, 2026, at the American Society of Clinical Oncology’s Genitourinary Cancers Symposium, add early evidence that microplastic exposure could be relevant to prostate cancer but do not establish cause and effect.

Is Delhi haze caused by Iran's petrol rain? Expert answers

In recent days, rumours circulating online have suggested that the haze over Delhi could be linked to smoke or chemical fallout from refinery strikes in Iran, even claiming that 'petrol rain' in the region was responsible for the unusual atmospheric conditions. An expert provides answers to these claims.

07 مايو 2026 16:53