Community Medicine Cheat Sheet
Environment Becomes Exposure
Environmental health: NAAQS pollutant standards, PM2.5 limits, noise rules, radiation ALARA and dose limits and unsafe water diseases for NEET-PG revision.
MedNext Academy | 3 min read
Environment Becomes Exposure
Environmental health: NAAQS pollutant standards, PM2.5 limits, noise rules, radiation ALARA and dose limits and unsafe water diseases for NEET-PG revision.
Environmental health hazards from air, water, noise and radiation become clinically meaningful when source, route, exposed group, dose and control point are identified together, guided by Indian standards such as NAAQS.
High-yield lines
- The National Ambient Air Quality Standards are notified under the Environment (Protection) Act 1986 and set limits for eight criteria pollutants.
- The annual PM2.5 standard in India is 40 micrograms per cubic metre and the 24-hour standard is 60 micrograms per cubic metre.
- The annual PM10 standard is 60 micrograms per cubic metre and the 24-hour standard is 100 micrograms per cubic metre.
- PM2.5 penetrates the alveoli, enters the bloodstream and raises cardiovascular and lung-cancer risk.
- The Noise Pollution Rules 2000 set residential limits of 55 dB(A) by day and 45 dB(A) at night, and silence-zone limits of 50 and 40.
- The occupational threshold for noise-induced hearing loss is 85 dB(A) time-weighted over 8 hours.
- NFHS-5 reported that about 41 percent of Indian households still used solid fuels for cooking.
- Pradhan Mantri Ujjwala Yojana, launched in 2016, provides LPG connections to below-poverty-line households as a health intervention.
- Radiation dose limits under the Atomic Energy Regulatory Board are 20 mSv per year for occupational exposure averaged over 5 years and 1 mSv per year for the public.
- The ALARA principle means keeping radiation dose As Low As Reasonably Achievable while meeting the diagnostic goal.
- Radiation effects are deterministic with a threshold, such as cataract, or stochastic with no safe threshold, such as cancer.
- Unsafe water transmits diarrhoea, cholera, enteric fever, hepatitis A and E, fluorosis and arsenicosis.
- The SPRED approach traces source, pathway, receptor, exposure dose and disease with its control decision for any environmental hazard.
- Lead is a neurotoxin to which children are most vulnerable, arising from battery smelting and old paint.
Mapped competency codes
- CM3.1
- CM3.2
- CM3.3
- CM3.4
- CM3.5
- CM3.6
- CM3.7
- CM3.8
Continue into the full chapter
This summary maps to CM3-environmental-health-problems.
Frequently Asked Questions
What is the annual PM2.5 standard under Indian NAAQS?
40 micrograms per cubic metre annual mean, with a 24-hour standard of 60 micrograms per cubic metre.
At what noise level is hearing protection mandatory occupationally?
At 85 dB(A) time-weighted average over 8 hours, above which engineering controls or ear protection are required.
What are the radiation dose limits under AERB?
20 mSv per year for occupational exposure averaged over 5 years and 1 mSv per year for members of the public.
What health scheme addresses indoor air pollution from cooking?
Pradhan Mantri Ujjwala Yojana provides LPG connections to below-poverty-line households, targeting child pneumonia, COPD and adverse pregnancy outcomes.
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