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From other border states like new hampshire and maine, and while new york city's air quality has clearly improved, it is still registering in the top five worst major cities in the entire world. >> david: trevor, thank you. let's get right to our meteorologist who is timing this out for us tonight. hi, rob. >> hi, david. it will be widespread for several more days. when you talk about population density it was the worst air quality our nation has had as a whole since 2006. let's get to those colorful maps and track where all that dangerous air is. buffalo into pittsburgh, virginia, north carol...

জনসংখ্যা বৃদ্ধি নিয়ে উৎকণ্ঠার উৎস ম্যালথাসের তত্ত্ব ছিল, জনসংখ্যা বাড়লে মাথাপিছু খাবার-সহ সব সম্পদ কমবে।

‘ডেমোগ্র্যাফিক ডিভিডেন্ড’-এর তাৎপর্য গোটা দুনিয়াতেই ক্রমবর্ধমান। বিশ্বব্যাপী বিভিন্ন দেশে জনসংখ্যা কমে যাচ্ছে।

Anywhere too hot or cold. population density is highest in temperate climates, like the uk, concentrated where the average temperature is around 13 degrees. there's another population peak in monsoon climates, which average around 27 degrees. partly this is because we rely on fertile river deltas, crops and livestock, but get any hotter and humans also start to see biological risks. in the worst case, it's so hot and humid that the body can't keep itself cool because it can't evaporate sweat. that's at the extreme. before you get to the extreme, we see cognitive functions like brain function d...

They’ve now won three of last four races by big margins. What the data shows.