MedicalHiranyagarbha · Class 11-12
Kan ka size, alveoli aur shehar ka calendar: saaf hawa ka trade-off
Kan ka size tay karta hai ki woh phephdon mein kahan tak jaayega — toh policy ko sabse pehle kis cheez ko rokna chahiye?
Socho pehle… phir dekho jawab
Deposition size par nirbhar hai: bade kan upar ki naliyon mein takra kar (impaction) ruk jaate hain, jabki PM2.5 jaise baarik kan alveoli tak pahunch jaate hain. Isliye public health ki nazar mein PM2.5 sabse bada nishana hai — aur uske source (vaahan, dhool, dhuaan) poore airshed mein faile hain.
Mechanism: alveoli ki deewar aur capillary milkar ek bahut patli respiratory membrane banate hain, jahan gas exchange diffusion se hota hai (partial pressure ke farak se). Baarik kan yahan pahunch kar macrophages (safai wali immune cells) ko active karte hain; lagaataar exposure se inflammation badhti hai, aur asthma jaisi pehle se maujood takleef wale logon ki pareshani tez ho sakti hai. Isliye sawaal sirf 'kitna pradooshan' nahi, 'kitne baarik kan' bhi hai.
Policy mechanism: GRAP 4 stages mein AQI ke hisaab se lagta hai — 'poor' (201-300) se 'severe plus' (450 se upar) tak — yaani reactive hai: curbs tab lagte hain jab phephdon par asar shuru ho chuka. Dilli ka naya calendar (1 Nov–28 Feb) pehle se rok lagata hai: bahar ke non-BS-VI vaahan, 50% office attendance, double parking fee, aur construction par do tiers ki rok.
Trade-off: calendar predictable hai — builder concrete ka kaam 31 October tak khatam kar sakte hain — par blunt bhi, kyunki saaf hafte mein bhi rok rehti hai, aur construction ban ka bojh daily-wage mazdooron par padta hai. Upar se, Dilli apne pradooshan ka lagbhag 30% khud banata hai, jabki 60-65% NCR se aata ya usse prabhavit hota hai. Airshed woh ilaaka hai jahan hawa aur pollutants saath mix hote aur chalte hain — shehar ki seema se bekhabar.
Ghar pe try karo
Ek 2-column table banao: 'GRAP (AQI-triggered)' vs 'Winter calendar (pehle se fixed)'. Har ek ke 2 fayde aur 2 kamiyan likho. Phir ek line: agar tum regulator hote, toh dono ko kaise jodte?
Wow!
Dilli ki hawa ka lagbhag do-tihai hissa Dilli ke bahar se aata ya prabhavit hota hai — isliye scientist shehar ki nahi, 'airshed' ki baat karte hain.
3 sawaal
- Alveoli mein gas exchange kis process se hota hai?
Jawab dekho
Diffusion. Partial pressure ke farak se gases patli membrane ke paar diffuse hoti hain.
- GRAP ka Stage I kis AQI band par lagta hai?
Jawab dekho
Poor (201-300). GRAP 'poor' (201-300) se shuru hota hai aur 'severe plus' (450+) tak jaata hai.
- Calendar approach ki ek asli kami kya hai?
Jawab dekho
Saaf hafte mein bhi rok rehti hai aur mazdooron ki kamaai rukti hai. Fixed calendar blunt hai aur construction ban ka bojh daily-wage mazdooron par padta hai.
NCERT se jodo: NCERT Class 11 Biology — breathing and exchange of gases; NCERT Class 11 Geography — atmosphere