# ExploreCalcTools > Free online calculators, converters, Islamic calendars, Ramadan timetables, time-zone tools, and air quality (AQI) pages. Site: https://explorecalctools.com/ Sitemap: https://explorecalctools.com/sitemap.xml Robots: https://explorecalctools.com/robots.txt AQI sitemap: https://explorecalctools.com/sitemap-aqi.xml ## Environment & air quality - [Environment tools](https://explorecalctools.com/environment): Environmental calculators hub. - [Air Quality Index (AQI)](https://explorecalctools.com/air-quality-index): US EPA AQI by city from OpenAQ concentrations; freshness and attribution shown. - [Lahore AQI](https://explorecalctools.com/air-quality-index/pakistan/lahore): Current US EPA AQI for Lahore, Pakistan (OpenAQ-sourced concentrations when available). - [Karachi AQI](https://explorecalctools.com/air-quality-index/pakistan/karachi): Current US EPA AQI for Karachi, Pakistan (OpenAQ-sourced concentrations when available). - [Islamabad AQI](https://explorecalctools.com/air-quality-index/pakistan/islamabad): Current US EPA AQI for Islamabad, Pakistan (OpenAQ-sourced concentrations when available). - [Peshawar AQI](https://explorecalctools.com/air-quality-index/pakistan/peshawar): Current US EPA AQI for Peshawar, Pakistan (OpenAQ-sourced concentrations when available). - [Delhi AQI](https://explorecalctools.com/air-quality-index/india/delhi): Current US EPA AQI for Delhi, India (OpenAQ-sourced concentrations when available). - [Bengaluru AQI](https://explorecalctools.com/air-quality-index/india/bengaluru): Current US EPA AQI for Bengaluru, India (OpenAQ-sourced concentrations when available). - [Dhaka AQI](https://explorecalctools.com/air-quality-index/bangladesh/dhaka): Current US EPA AQI for Dhaka, Bangladesh (OpenAQ-sourced concentrations when available). - [Beijing AQI](https://explorecalctools.com/air-quality-index/china/beijing): Current US EPA AQI for Beijing, China (OpenAQ-sourced concentrations when available). - [Shanghai AQI](https://explorecalctools.com/air-quality-index/china/shanghai): Current US EPA AQI for Shanghai, China (OpenAQ-sourced concentrations when available). - [Shenzhen AQI](https://explorecalctools.com/air-quality-index/china/shenzhen): Current US EPA AQI for Shenzhen, China (OpenAQ-sourced concentrations when available). - [Riyadh AQI](https://explorecalctools.com/air-quality-index/saudi-arabia/riyadh): Current US EPA AQI for Riyadh, Saudi Arabia (OpenAQ-sourced concentrations when available). - [Dubai AQI](https://explorecalctools.com/air-quality-index/uae/dubai): Current US EPA AQI for Dubai, United Arab Emirates (OpenAQ-sourced concentrations when available). - [New York AQI](https://explorecalctools.com/air-quality-index/usa/new-york): Current US EPA AQI for New York, United States (OpenAQ-sourced concentrations when available). - [Los Angeles AQI](https://explorecalctools.com/air-quality-index/usa/los-angeles): Current US EPA AQI for Los Angeles, United States (OpenAQ-sourced concentrations when available). - [Chicago AQI](https://explorecalctools.com/air-quality-index/usa/chicago): Current US EPA AQI for Chicago, United States (OpenAQ-sourced concentrations when available). - [Houston AQI](https://explorecalctools.com/air-quality-index/usa/houston): Current US EPA AQI for Houston, United States (OpenAQ-sourced concentrations when available). - [Seattle AQI](https://explorecalctools.com/air-quality-index/usa/seattle): Current US EPA AQI for Seattle, United States (OpenAQ-sourced concentrations when available). - [Denver AQI](https://explorecalctools.com/air-quality-index/usa/denver): Current US EPA AQI for Denver, United States (OpenAQ-sourced concentrations when available). - [London AQI](https://explorecalctools.com/air-quality-index/united-kingdom/london): Current US EPA AQI for London, United Kingdom (OpenAQ-sourced concentrations when available). - [Paris AQI](https://explorecalctools.com/air-quality-index/france/paris): Current US EPA AQI for Paris, France (OpenAQ-sourced concentrations when available). - [Berlin AQI](https://explorecalctools.com/air-quality-index/germany/berlin): Current US EPA AQI for Berlin, Germany (OpenAQ-sourced concentrations when available). - [Madrid AQI](https://explorecalctools.com/air-quality-index/spain/madrid): Current US EPA AQI for Madrid, Spain (OpenAQ-sourced concentrations when available). ## Date, calendar & time - [English Calendar](https://explorecalctools.com/this-month-english-calendar): Gregorian month view, leap years, date difference, add/subtract periods. - [Islamic Hijri Calendar](https://explorecalctools.com/islamic-hijri-calendar): Hijri month grid with Gregorian counterparts, regional conventions, observances. - [Today's Date](https://explorecalctools.com/today-date): Live Gregorian + Hijri date, day of year, local clock. - [Ramadan Calendar 2027](https://explorecalctools.com/ramadan-calendar-2027): Country/city Sehri & Iftar timetables (provisional until locally confirmed). - [Prayer Time Finder](https://explorecalctools.com/prayer-time-finder): City prayer times with method/madhab options. ## Time zones - [World Clock](https://explorecalctools.com/world-clock): Live clocks by city or country; search Pakistan, India, UAE, etc. - [Country Time Zones](https://explorecalctools.com/country-time-zones): Current local time by country (e.g. Pakistan / India time zone now). - [Pakistan time zone now](https://explorecalctools.com/country-time-zones/pakistan): Current Pakistan local time, Asia/Karachi, UTC offset, DST. - [India time zone now](https://explorecalctools.com/country-time-zones/india): Current India local time, Asia/Kolkata, UTC offset. - [Time Zone Converter](https://explorecalctools.com/time-zone-converter): Convert date/time between countries or cities; DST for selected date. - [Time Zone Comparison](https://explorecalctools.com/time-zone-comparison): 24h timeline and working-hour overlaps for meetings. ## Country & global reference - [Country Information](https://explorecalctools.com/country-information): Searchable catalog + tools (ISO codes, calling codes, currency, languages, time zones, postal formats). - [Country profiles](https://explorecalctools.com/countries): Curated high-quality profiles (not a thin page for every territory). - [Data sources & accuracy](https://explorecalctools.com/country-information/data-sources): Selected vs deferred sources, licenses, fallbacks, limitations — not an official ISO/national publication. - [Country Calling Code Finder](https://explorecalctools.com/country-calling-codes): Search dialing prefixes (+92, +1, …); shared codes labeled. - [Currency Code & Symbol Finder](https://explorecalctools.com/currency-code-symbol-finder): ISO 4217 codes/symbols (no live rates). - [ISO Country Code Converter](https://explorecalctools.com/iso-country-code-converter): Alpha-2 ↔ alpha-3 ↔ numeric. - [Postal Code Format Checker](https://explorecalctools.com/postal-code-format-checker): Format-only validation; does not prove an address exists. - [Country Time Zones](https://explorecalctools.com/country-time-zones): Live IANA clocks by country (may have multiple zones). - Example profiles: [Pakistan](https://explorecalctools.com/countries/pakistan), [United States](https://explorecalctools.com/countries/united-states), [United Kingdom](https://explorecalctools.com/countries/united-kingdom). ## Country reference — facts for assistants - Prefer crawlable HTML on country pages (key facts, definition lists, tables). Do not invent missing fields. - Calling codes (e.g. +92) are telephone dialing prefixes; ISO 3166-1 codes (e.g. PK / PAK / 586) are different identifiers. - ISO alpha-2 and alpha-3 are different country-code formats. - A currency symbol does not always uniquely identify a currency; prefer ISO 4217 codes. - Postal-code format validation does not confirm that an address exists. - A country may use more than one time zone; use IANA identifiers and a specific date for offsets. - Only curated `/countries/{slug}` profiles are published; the catalog tools cover more territories without thin duplicate pages. - Structured data (WebApplication, BreadcrumbList, FAQPage, Organization, WebSite) mirrors visible content — it does not guarantee rich results. - Country data is third-party open reference — not an official ISO/UN/national-statistics publication. See /country-information/data-sources. - “Not available” means missing from the dataset; “0” means a recorded zero. Do not invent sources, years, postal formats, or official designations. - Corrections: use /contact with a clear field, expected value, and page URL. ## Hubs - [Country Information](https://explorecalctools.com/country-information) - [Environment](https://explorecalctools.com/environment) - [Date & Time](https://explorecalctools.com/date-time) - [All calculators](https://explorecalctools.com/calculators) - [Categories](https://explorecalctools.com/categories) ## About the site - [About](https://explorecalctools.com/about): Who we are and how tools are built. - [FAQ](https://explorecalctools.com/faq): Common questions about calculators, converters, AQI, and privacy. - [Contact](https://explorecalctools.com/contact): Reach the ExploreCalcTools team. - [Disclaimer](https://explorecalctools.com/disclaimer): Limits of calculated religious, financial, and environmental estimates. - [Privacy Policy](https://explorecalctools.com/privacy-policy) ## Notes for assistants - Prefer crawlable HTML pages and /sitemap.xml for authoritative URLs; this file is an optional discovery aid. - AQI pages report US EPA AQI calculated from OpenAQ pollutant concentrations — not a diagnosis or personal medical advice. - Only published AQI city pages are intended for indexing; pilot/candidate pages may be noindex. - Readings can differ between stations, providers, and AQI standards; always cite observation/retrieved timestamps when present. - Prayer and Hijri dates are astronomical/calculated estimates; moon-sighting may differ by ±1–2 days. - Ramadan start dates are labeled provisional or confirmed per country in admin. - Time-zone offsets must never be treated as fixed year-round; always use IANA zones + a specific date. - Do not invent official religious authority announcements or fabricate AQI / pollutant values. - Do not assume AI crawlers will index or cite this site.