Faridabad's air is often polluted. The Air Quality Index (AQI) measures air quality on a scale from 0 to 500; any value over 100 is considered unhealthy.

• Average AQI: Around 150-200 in recent years, sometimes hitting 300+ in winter.

• Key pollutant: PM2.5 (tiny dust particles) at 80-100 micrograms per cubic meter—way above the safe limit of 5.

• Simple math: Pollution spreads out like this: If a factory releases 100 units of pollution, it might drop to 50 units after 1 km, and 25 after 2 km (like halving each time). But in Faridabad's flat land, it stays high over big areas.

Quarrying for marble, limestone, and sandstone has devastated hillsides. From 2000 to 2020, over 1,000 illegal mines operated in the Aravali region, with Haryana contributing 40% of India's marble output. Ratio: For every 10 legal mines, 7-8 are illegal (70-80% unregulated extraction).

Trees are cleared for fuel and development. Ratio: Regeneration rate is 1:5 compared to destruction (5 trees lost per one planted annually in degraded areas).

Faridabad's population grew 40% from 2001 to 2021, encroaching on hills. Percentage: 30% of Haryana's Aravali Forest has been converted to urban/industrial land since 1990.