Pollution & Protocols — Set 2

Correct Answer: B. Ground-level Ozone

• **Ground-level Ozone** = the main component of photochemical smog, formed when sunlight reacts with nitrogen oxides (NOx) and volatile organic compounds (VOCs) from vehicles. • **Photochemical smog** — forms on sunny days in urban areas with heavy traffic; unlike stratospheric ozone, ground-level ozone irritates the eyes, nose, and lungs. • 💡 Wrong-option analysis: Ammonia: contributes to particulate formation but is not the main component of photochemical smog; Sulphur Dioxide: causes London-type smog (industrial smog), not photochemical smog; Carbon Dioxide: a greenhouse gas, not a component of photochemical smog.

Correct Answer: C. Transboundary movements of hazardous wastes

• **Basel Convention** = the international treaty controlling transboundary movements of hazardous wastes, especially from developed to developing nations. • **1989** — year the Basel Convention was adopted; it defines hazardous waste broadly by origin and requires prior informed consent before export. • 💡 Wrong-option analysis: Desertification: addressed by UNCCD, not the Basel Convention; Global warming: governed by UNFCCC and the Kyoto/Paris agreements; Ozone depletion: the Montreal Protocol's domain, not the Basel Convention.

Correct Answer: C. Agricultural runoff

• **Agricultural runoff** = a non-point source of water pollution because it originates from large, diffuse land areas rather than a single identifiable pipe or outlet. • **Non-point source** — harder to regulate than point sources; carries fertilizers, pesticides, and sediment over wide distances into rivers and lakes. • 💡 Wrong-option analysis: Sewage treatment plant: a point source because it discharges from a specific, identifiable pipe; Industrial pipe: a classic point source with a traceable discharge location; Oil refinery: discharges from defined outlets, making it a point source.

Correct Answer: B. Decibel

• **Decibel (dB)** = the logarithmic unit used to measure sound intensity; every 10 dB increase represents a tenfold rise in sound pressure level. • **85 dB** — the safe exposure limit; prolonged exposure above this level causes permanent hearing damage (noise-induced hearing loss). • 💡 Wrong-option analysis: Joule: a unit of energy, not sound intensity; Hertz (Hz): measures the frequency (pitch) of sound, not its loudness or intensity; Pascal: measures pressure and is related to sound, but decibels are the standard unit for noise pollution assessment.

Correct Answer: D. Rio de Janeiro

• **Rio de Janeiro** = the city in Brazil that hosted the 1992 Earth Summit (UNCED), which produced key environmental frameworks still active today. • **1992** — year of the Earth Summit; it led to the creation of Agenda 21, the UNFCCC (climate), the CBD (biodiversity), and the CCD (desertification). • 💡 Wrong-option analysis: Johannesburg: hosted the World Summit on Sustainable Development in 2002 (Rio+10), not the original 1992 Earth Summit; Stockholm: hosted the first UN Conference on the Human Environment in 1972, the precursor to modern environmental law; Paris: associated with the 2015 Paris Climate Agreement, not the 1992 Earth Summit.

Correct Answer: D. Cadmium

• **Cadmium** = the heavy metal responsible for Itai-Itai disease, causing severe skeletal damage and kidney failure through chronic poisoning via contaminated food and water. • **Japan, 1950s** — Itai-Itai disease was first identified in the Jinzu River basin where cadmium-laced water from a zinc mine contaminated rice crops. • 💡 Wrong-option analysis: Arsenic: causes Arsenicosis (skin lesions, cancer) in areas with contaminated groundwater, not Itai-Itai; Lead: causes Plumbism (neurological damage), not skeletal softening; Mercury: causes Minamata disease (neurological damage), not Itai-Itai.

Correct Answer: B. Carbon Monoxide

• **Carbon Monoxide (CO)** = a colourless, odourless gas called the 'silent killer' because it binds to haemoglobin 200 times more strongly than oxygen, preventing oxygen transport. • **Incomplete combustion** — the primary cause of CO production; faulty heaters, vehicles in enclosed spaces, and generators are common sources of fatal CO poisoning. • 💡 Wrong-option analysis: Methane: flammable and a greenhouse gas but not acutely toxic at normal concentrations; Carbon Dioxide: displaces oxygen at very high concentrations but has distinct odour cues at dangerous levels; Nitrogen Dioxide: reddish-brown gas with a pungent odour, not colourless and odourless.

Correct Answer: D. Wetlands

• **Ramsar Convention** = the international treaty signed in 1971 in Ramsar, Iran, for the conservation and wise use of wetlands worldwide. • **1971** — year the Ramsar Convention was signed; it is the oldest modern intergovernmental environmental treaty and designates 'Wetlands of International Importance'. • 💡 Wrong-option analysis: Grasslands: protected under various national frameworks but no specific global convention like Ramsar; Tropical Rainforests: covered partly under CBD and UNFCCC carbon sink provisions, not a dedicated treaty like Ramsar; Coral Reefs: protected indirectly through marine agreements but have no single dedicated convention.

Correct Answer: D. Biomass fuel

• **Biomass fuel** = the burning of wood, charcoal, dung, and crop residues for cooking, which is the primary cause of indoor air pollution in rural households. • **3 billion people** — the estimated number globally who rely on biomass fuels for cooking, with exposure to indoor smoke linked to 4 million deaths per year from respiratory disease. • 💡 Wrong-option analysis: Electronic waste: an outdoor/industrial pollution issue, not a source of indoor smoke; Air conditioners: can recirculate pollutants but are not a source of indoor combustion pollution; Pesticides: outdoor agricultural chemicals that can drift indoors, but are not the primary cause of indoor air pollution in rural homes.

Correct Answer: D. Nagoya Protocol

• **Nagoya Protocol** = a supplementary agreement to the Convention on Biological Diversity (CBD) that ensures fair and equitable sharing of benefits from the use of genetic resources. • **2010** — year the Nagoya Protocol was adopted in Nagoya, Japan; it entered into force in 2014 and is a key tool against 'biopiracy'. • 💡 Wrong-option analysis: Kyoto Protocol: focuses on reducing greenhouse gas emissions, not genetic resource benefit-sharing; Paris Agreement: a climate change treaty about temperature targets, unrelated to biodiversity; Montreal Protocol: targets ozone-depleting substances, not genetic resources.