{"id":21968,"date":"2025-11-29T16:49:20","date_gmt":"2025-11-29T11:19:20","guid":{"rendered":"https:\/\/www.aqi.in\/blog\/?p=21968"},"modified":"2025-11-29T17:10:33","modified_gmt":"2025-11-29T11:40:33","slug":"grap-4-in-mumbai-aqi-november-2025","status":"publish","type":"post","link":"https:\/\/www.aqi.in\/blog\/grap-4-in-mumbai-aqi-november-2025\/","title":{"rendered":"GRAP 4 in Mumbai: AQI 300+ Spikes Across the City\u2019s Key Neighbourhoods"},"content":{"rendered":"\n<p><span style=\"font-weight: 400;\">Mumbai has always believed its coastline protects it from the severe winter smog seen in North India. For years, that belief held true. But data from the 4th week of November shows that this comfort is fading.\u00a0<\/span><span style=\"font-weight: 400;\">Traditionally considered safer because of its sea breeze and coastal wind patterns, the city has now witnessed air quality levels severe enough pushing <\/span><b>BMC to trigger GRAP Stage 4, in several regions in Mumbai on Friday, November 28, 2025<\/b><span style=\"font-weight: 400;\">. These areas are: <\/span><b>Mazgaon, Malad, Deonar, Borivali (East), Chakala Andheri (East), Navy Nagar, Mulund (West) and Powai, <\/b><span style=\"font-weight: 400;\">neighbourhoods showing consistent pollution for a while now.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This shift doesn\u2019t mean Mumbai has become Delhi. But it does mean the <\/span><b>pattern<\/b><span style=\"font-weight: 400;\"> of winter pollution is starting to look worryingly similar.<\/span><\/p>\n<p>\u00a0<\/p>\n<h2><b>Why Mumbai Introduced GRAP 4\u00a0<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The following graph showing AQI data (source : <\/span><a href=\"http:\/\/aqi.in\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">AQI.in<\/span><\/a><span style=\"font-weight: 400;\">) from <\/span><b>24 to 28 November<\/b><span style=\"font-weight: 400;\">, plotted for <\/span><b>Chakala Andheri East, Malad, and Borivali East<\/b><span style=\"font-weight: 400;\">, reveal repeated surges above <\/span><b>AQI 300<\/b><span style=\"font-weight: 400;\">, pushing the city into the Very Poor category multiple times a day.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21981\" src=\"https:\/\/www.aqi.in\/blog\/wp-content\/uploads\/2025\/11\/mumbai-aqi-graph.png\" alt=\"Graph showing AQI levels in various areas in Mumbai\" width=\"800\" height=\"471\" \/><\/span><\/p>\n<h3><strong>1. AQI Crossed 300 Repeatedly Across the City<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">The graph shows three of the locations where GRAP 4 is activated, <\/span><b>Chakala Andheri East, Malad, and Borivali East<\/b><span style=\"font-weight: 400;\">, crossing <\/span><b>AQI 300<\/b><span style=\"font-weight: 400;\"> multiple times between <\/span><b>24 to 28 November<\/b><span style=\"font-weight: 400;\">. <\/span><b>As a result<\/b><span style=\"font-weight: 400;\">, the city entered the Very Poor category multiple times a day.<\/span><\/p>\n<h3><strong>2. Highest Pollution Peak: AQI 342 on Nov 27, 5 AM<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">The maximum average AQI rose to 342 during an early-morning surge. <\/span><b>This clearly reflects<\/b><span style=\"font-weight: 400;\"> trapped pollutants and strong overnight stagnation.<\/span><\/p>\n<h3><strong>3. Consistent Morning and Evening Peaks<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Every day shows two clear surges:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Morning peaks (5 to 10 AM)<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Evening peaks (6 to 11 PM)<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Moreover, these peaks highlight the combined effect of traffic emissions, construction dust, and stagnant winter air.<\/span><\/p>\n<h3><strong>4. Night-Time Ventilation Failed to Clear Pollutants<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Even after midnight, AQI stays elevated between <\/span><b>200 to 250<\/b><span style=\"font-weight: 400;\">, which means:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zero dispersion<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Trapped pollutants<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A winter <\/span><b>temperature inversion<\/b><span style=\"font-weight: 400;\"> effect, similar to Delhi NCR conditions<\/span><\/li>\n<\/ul>\n<h3><strong>5. Data Shows a Persistent, Multi-Day Pollution Episode before GRAP 4<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">From 24 to 28 November, AQI curves never return to healthy levels, demonstrating a <\/span><b>prolonged high-pollution phase<\/b><span style=\"font-weight: 400;\">, the exact condition that triggers <\/span><b>GRAP 4<\/b><span style=\"font-weight: 400;\"> action.<\/span><\/p>\n<p>\u00a0<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-22003\" src=\"https:\/\/www.aqi.in\/blog\/wp-content\/uploads\/2025\/11\/Why_GRAP_4_Was_Introduced_in_Mumbai_-_What_the_Data_Shows1.png\" alt=\"Image showing Why GRAP 4 was needed in Mumbai\" width=\"800\" height=\"800\" \/><\/p>\n<h2>\u00a0<\/h2>\n<h2><strong>What Restrictions Would Come Into Effect with GRAP 4<\/strong><\/h2>\n<p><b>GRAP-4 is the lowest level<\/b><span style=\"font-weight: 400;\"> of Mumbai\u2019s Graded Response Action Plan. It is applied during <\/span><b>Moderate to Poor<\/b><span style=\"font-weight: 400;\"> air quality. <\/span><span style=\"font-weight: 400;\">It is activated when <\/span><b>PM2.5 levels reach 61\u2013120 \u03bcg\/m\u00b3<\/b><span style=\"font-weight: 400;\"> or <\/span><b>PM10 reaches 101\u2013350 \u03bcg\/m\u00b3<\/b><span style=\"font-weight: 400;\">, indicating early signs of pollution rise. <\/span><b>Under GRAP-4, authorities implement the following actions:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Strictly enforce garbage-burning bans in landfills and public spaces.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ensures dust control at construction sites.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tighten industrial emission rules and close violating units.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Deploy traffic teams to prevent congestion-related emissions.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Intensify PUC checks for vehicles.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Carry out mechanised road sweeping and water sprinkling, including on unpaved roads.<\/span><\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<h2><b>Dip in AQI after GRAP 4 activated in Mumbai<\/b><\/h2>\n<p>After GRAP 4 was introduced on Friday, the AQI across all three locations dropped sharply from the peak <b>342 at 5 AM<\/b><span style=\"font-weight: 400;\"> to around <\/span><b>158 by 3 PM<\/b><span style=\"font-weight: 400;\">, marking the cleanest point of the week. This is the first significant drop after days of persistent 300+ levels.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This synchronized decline in <\/span><b>Andheri East, Malad, and Borivali East<\/b><span style=\"font-weight: 400;\"> indicates that the immediate GRAP-4 restrictions, construction halts, dust suppression, and traffic controls, helped break the continuous high-pollution cycle and allowed the city\u2019s air to recover.<\/span><\/p>\n<p><a href=\"https:\/\/www.aqi.in\/dashboard\/india\/maharashtra\/mumbai\"><span style=\"font-weight: 400;\">Click here for more realtime air quality insights for Mumbai<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p>\u00a0<\/p>\n<h2><b>Conclusion : GRAP 4 Needed for Mumbai\u2019s Pollution Control<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">In conclusion, the AQI graph makes one thing absolutely clear : Mumbai\u2019s pollution in the <\/span><b>fourth week of November<\/b><span style=\"font-weight: 400;\"> was significant enough to justify GRAP Stage 4.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The persistence of <\/span><b>AQI 300+<\/b><span style=\"font-weight: 400;\">, synchronized deterioration across suburbs, and lack of nighttime dispersion all pointed to a city entering an emergency phase. GRAP 4 is a necessary response based on real, measurable, city-wide data. Check your nearby air quality on <\/span><a href=\"http:\/\/aqi.in\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">AQI.in<\/span><\/a><span style=\"font-weight: 400;\"> right now.<\/span><\/p>\n<p><br \/><br \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mumbai has always believed its coastline protects it from the severe winter smog seen in North India. For years, that&hellip;<\/p>\n","protected":false},"author":31,"featured_media":22020,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5080,1],"tags":[18,167,27,9,83,5078,5079,5075,5077,5076],"class_list":["post-21968","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mumbai-pollution-2","category-air-pollution","tag-air-pollution","tag-air-pollution-in-india","tag-air-quality","tag-aqi","tag-aqi-india","tag-grap4","tag-grap4mumbai","tag-mumbaiairpollution","tag-mumbaiairquality","tag-mumbaiaqi"],"_links":{"self":[{"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/posts\/21968","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/users\/31"}],"replies":[{"embeddable":true,"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/comments?post=21968"}],"version-history":[{"count":6,"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/posts\/21968\/revisions"}],"predecessor-version":[{"id":22031,"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/posts\/21968\/revisions\/22031"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/media\/22020"}],"wp:attachment":[{"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/media?parent=21968"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/categories?post=21968"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.aqi.in\/blog\/wp-json\/wp\/v2\/tags?post=21968"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}